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  nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ???????? 1 ? rev 1.1 consumer dram jul. 2011 feature cas latency frequency speed sorts ddr-333 -6k/-6ki ddr400 -5t/-5ti ddr500 -4t units cl-trcd-trp 2.5-3-3 3-3-3 3-4-4 tck cl=2 266 266 - cl=2.5 333 333 333 speed cl=3 333 400 500 mbps z power supply voltage: v dd =v ddq =2.5v ? 0.2v (ddr-333) v dd =v ddq =2.6v ? 0.1v (ddr-400/500) z 4 internal memory banks for concurrent operation. z cas latency: 2, 2.5 and 3 z double data ra te architecture z bidirectional data strobe (dqs) is transmitted and received with data, to be used in capturing data at the receiver. z industrial grade device support -40 ~95 operating temperature (-75i/-6ki/5ti) z 2kb page size for all configurations. z dqs is edge-aligned with data for reads and is center-aligned with data for writes z differential clock inputs (ck and ck ) z data mask (dm) for write data z dll aligns dq and dqs transition with ck transitions. z commands entered on each positive ck edge; data and data mask referenced to both edges of dqs z burst lengths: 2, 4 or 8 z auto precharge option for each burst access z auto-refresh and self-refresh mode z 7.8 s max. average periodic refresh interval z 2.5v (sstl_2 compatible) i/o z rohs compliance z jedec standard compliance z packages: 66 pin tsopii
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? 2 ? rev 1.1 consumer dram jul. 2011 description nanya 512mb sdrams is a high-speed cmos double data rate sdram containing 536,870,912 bits. it is internally configured as a qual-bank dram. the 512mb chip is organized as 16mbit x 8 i/o x 4 bank or 8m bit x 16 i/o x 4 bank device. these synchronous devices achieve high speed double-data-rate transfer rates of up to 500 (400, 333 or 266) mhz for general applications. the 512mb ddr sdram uses a double-data-rate architecture to achieve high speed operation. the double data rate architecture is essentially a 2 ? prefetch architecture with an interface desig ned to transfer two data words per clock cycle at the i/o pins. a single read or write access for the 512mb ddr sdram effe ctively consists of a single 2n -bit wide, one clock cycle data transfer at the internal dra m core and two corresponding n-bit wide, one-half-clock-cycle data transfers at the i/o pins. a bidirectional data strobe (dqs) is transmitted externally, along wi th data, for use in data capture at the receiver. dqs is a strobe transmitted by the ddr sdram during reads and by the me mory controller during writes. dqs is edge-aligned with data for reads and center-aligned with data for writes. the 512mb ddr sdram operates from a differential clock (ck and ck ; the crossing of ck going high and ck going low is referred to as the positive edge of ck ). commands (address and control signals) are registered at every positive edge of ck. input data is registered on both edges of dqs, and out put data is referenced to both edges of dqs, as well as to both edges of ck. read and write accesses to the ddr sdram are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. a ccesses begin with the registration of an active command, which is then followed by a read or write command. the address bits registered coincident with the active command are used to select the bank and row to be accessed. the address bi ts registered coincident with the read or write command are used to select the bank and the starti ng column location for the burst access. the ddr sdram provides for programmable re ad or write burst lengths of 2, 4, or 8 locations. an auto precharge func- tion may be enabled to provide a self-timed row precharge that is initiated at t he end of the burst access. as with standard sdrams, the pipelined, multibank architectu re of ddr sdrams allows for concurrent operation, thereby providing high effective bandwidth by hiding row precharge and activation time. an auto refresh mode is provided along with a power-saving po wer down mode. all inputs are compatible with the jedec standard for sstl_2. all outputs ar e sstl_2, class ii compatible. the functionality described and the timing s pecifications included in this data s heet are for the dll enabled mode of operation.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 3 ? rev 1.1 consumer dram jul. 2011 ordering information standard grade speed organization part number package clock (mhz) cl-t rcd -t rp nt5ds64m8ds ? 6k 166 2.5-3-3 64m x 8 nt5ds64m8ds ? 5t 200 3-3-3 nt5ds32m16ds ? 6k 166 2.5-3-3 32m x 16 nt5ds32m16ds ? 5t 66 pin tsop-ii 200 3-3-3 industrial grade speed organization part number package clock (mhz) cl-t rcd -t rp nt5ds64m8ds ? 6ki 166 2.5-3-3 64m x 8 nt5ds64m8ds ? 5ti 200 3-3-3 nt5ds32m16ds ? 6ki 166 2.5-3-3 32m x 16 nt5ds32m16ds ? 5ti 66 pin tsop-ii 200 3-3-3
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 4 ? rev 1.1 consumer dram jul. 2011 pin configuration ? 400 mil tsop ii (x4 / x8 / x16) < top view> see the balls through the package ? organization column address 64mb x 8 a0-a9, a11 32mb x 16 a0-a9
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 5 ? rev 1.1 consumer dram jul. 2011 input / output functional description symbol type function ck, ck input clock: ck and ck are differential clock inputs. all address and control input signals are sampled on the crossing of the positive edge of ck and negative edge of ck . output (read) data is referenced to the crossings of ck and ck (both directions of crossing). cke input clock enable: cke high activates, and cke low deactivates in ternal clock signals, and device input buffers and output drivers. taking cke low provides precha rge power--down and self refresh operation (all banks idle), or active power--down (row active in any bank). cke is synchronous for power-- down entry and exit, and for self refresh entry. cke is asynchronous for self refresh exit, and for output disable. cke must be maintained high throughout read and write accesses. input buffers, excluding ck, ck and cke are disabled during power--down. input buffers, excluding cke are disabled during self refresh. cke is an sstl_2 input, but will detect an lvcmos low level after vdd is applied upon 1st power up. after vref has become stable during the power on and initialization sequence, it must be maintained for proper operation of the cke receiver. for proper self--refresh entry and exit, vref must be maintained to this input the standard pinout includes one cke pin. optional pinouts include cke0 and cke1 on different pins, to facilitate device stacking. cs input chip select: all commands are masked when cs is registered high. cs provides for external rank selection on systems with multiple memory ranks. cs is considered part of the command code. ras , cas , we input command inputs: ras , cas and we (along with cs ) define the command being entered. dm, ldm, udm input input data mask: dm is an input mask signal for write data. input data is masked when dm is sampled high along with that input data during a write access. dm is sampled on both edges of dqs. although dm pins are input only, the dm loading matches the dq and dqs loading. for the x16, ldm corresponds to the data on dq0--dq7; udm corresponds to the data on dq8--dq15. dm may be driven high, low, or floating during reads. ba0 ? ba1 input bank address inputs: ba# defines to which bank an active, read, write or pre-charge command is being applied. a0 ? a12 input address inputs: provide the row address for active commands, and the column address and auto precharge bit for read/write commands, to select one location out of the memory array in the respective bank. a10 is sampled during a precharge command to determine whether the precharge applies to one bank (a10 low) or all banks (a10 high). if only one bank is to be precharged, the bank is selected by ba0, ba1. the address inputs also provide the op--code during a mode register set command. ba0 and ba1 define which mode register is loaded during the mode register set command (mrs or emrs). dq input/output data bus: inputs/output dqs, ( dqs ) ldqs, ( ldqs ), udqs,( udqs ) input/output data strobe: output with read data, input with wr ite data. edge--aligned with read data, centered in write data. used to capture write data. for the x16, ldqs corresponds to the data on dq0--dq7; udqs corresponds to the data on dq8--dq15. rdqs, ( rdqs ) input/output read data strobe: for x8 components a rdqs and rdqs pair can be enabled via emrs(1) for real timing. rdqs and rdqs is not support x16 components. rdqs and rdqs are edge-aligned with real data. if enable rdqs and rdqs then dm function will be disabled. nc  no connect: no internal electrical connection is present. v ddq supply dq power supply: 2.5v 0.2v (-6k/-6ki); vdd=vddq=2.6v0.1v (-5t/-5ti/-4t) v ssq supply dq ground v dd supply power supply: 2.5v 0.2v (-6k/-6ki); vdd=vddq=2.6v0.1v (-5t/-5ti/-4t) v ss supply ground v ref supply sstl_2 reference voltage
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 6 ? rev 1.1 consumer dram jul. 2011 block diagram (64mb x 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 7 ? rev 1.1 consumer dram jul. 2011 block diagram (32mb x 16)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 8 ? rev 1.1 consumer dram jul. 2011 functional description the 512mb ddr sdram is a high-speed cmos, dynamic random-access memory containing 536,870,912 bits. the 512mb ddr sdram is internally configured as a quad-bank dram. the 512mb ddr sdram uses a double-data-rate architecture to achi eve high-speed operation. the double-data-rate architecture is essentially a 2n prefetch architecture, with an interface designed to transfer two data words per clock cycle at the i/o pins. a single read or write access for the 512mb ddr sdram consists of a single 2n -bit wide, one clock cycle data transfer at the internal dram core and two corresponding n-bit wide, one-hal f clock cycle data transf ers at the i/o pins. read and write accesses to the ddr sdram are burst oriented; accesses start at a selected location and continue for a pro- grammed number of locations in a programmed sequence. accesses begi n with the registration of an active command, which is then followed by a read or write command. the address bits registered co incident with the active command are used to select the bank and row to be accessed (ba0, ba1 select the bank; a0-a12 select the row). the address bits registered coincident with the read or write command are used to select the starting column location for the burst access. prior to normal operation, the ddr sdram must be initialized. the following sections provide detailed information covering devi ce initialization, register definition, comm and descriptions and device operation. initialization only one of the following two conditions must be met. ? no power sequencing is specified during power up or power down given the following criteria: v dd and v ddq are driven from a single power converter output v tt meets the specification a minimum resistance of 42 ohms limits the inpu t current from the vtt supply into any pin and v ref tracks v ddq /2 or ? the following relationships must be followed: v ddq is driven after or with v dd such that v ddq < v dd + 0.3v v tt is driven after or with v ddq such that v tt < v ddq + 0.3v v ref is driven after or with v ddq such that v ref < v ddq + 0.3v the dq and dqs outputs are in the high-z state, where they remain until driven in normal operation (by a read access). after a ll power supply and reference voltages are stable, and the clock is stable, the ddr sdram requires a 200 s delay prior to applying an executable command. once the 200 s delay has been satisfied, a deselect or nop comm and should be applied, and cke must be brought high. following the nop command, a precharge all command must be appl ied. next a mode register se t command must be issued for the extended mode register, to enable the dll, and then a mode register set command must be issued for the mode register, to reset the dll, and to program the operatin g parameters. 200 clock cycles are required between the dll reset and any read command. a precharge all command should be applied, placing the device in the ?all banks idle? state once in the idle state, two auto refresh cycles must be perf ormed. additionally, a mode register set command for the mode regis ter, with the reset dll bit deactivated (i.e. to program operating parameters without resetting the dll) must be performed. followin g these cycles, the ddr sdram is ready for normal operation. ddr sdram?s may be reinitialized at any time during normal opera tion by asserting a valid mrs command to either the base or extended mode registers without affecting the contents of the memory array. the contents of either the mode register or extende d mode register can be modified at any valid time during device operation without affect ing the state of the internal address ref resh counters used for device refresh.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 9 ? rev 1.1 consumer dram jul. 2011 register definition mode register the mode register is used to define the specific mode of operat ion of the ddr sdram. this definition includes the selection of a burst length, a burst type, a cas latency, and an operating mode . the mode register is programmed via the mode register set command (with ba0 = 0 and ba1 = 0) and retains the stored inform ation until it is programmed again or the device loses power (except for bit a8, which is self-clearing). mode register bits a0-a2 specify the burst length, a3 specif ies the type of burst (sequential or interleaved), a4-a6 specify th e cas latency, and a7-a12 specify the operating mode. the mode register must be loaded when all banks are idle, and the controller must wait the specified time before initiating the subsequent operation. violating either of these requirements results in unspecified operation. burst length read and write accesses to the ddr sdram are burst oriented, with the burst length being programmable. the burst length determines the maximum number of column locations that can be acce ssed for a given read or write command. burst lengths of 2, 4 , or 8 locations are available for both the sequential and the interleaved burst types. reserved states should not be used, as unknown operation or incompatibility with future versions may result. when a read or write command is issued, a block of columns equa l to the burst length is effectively selected. all accesses for that burst take place within this block, meaning that the burst wraps within the block if a boundary is reached. the block is unique ly selected by a1-ai when the burst length is set to two, by a 2 -ai when the burst length is set to four and by a 3 -ai when the burst length is set to eight (where ai is the most significant column addr ess bit for a given configuration) . the remaining (least significa nt) address bit(s) is (are) used to select the star ting location within the block. the program med burst length applies to both read and wri te bursts.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 10 ? rev 1.1 consumer dram jul. 2011 mode register operation
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 11 ? rev 1.1 consumer dram jul. 2011 burst definition starting colume address orde r of accesses within a burst burst length a2 a1 a0 type=sequential type=interleaved - - 0 0-1 0-1 2 - - 1 1-0 1-0 - 0 0 0-1-2-3 0-1-2-3 - 0 1 1-2-3-0 1-0-3-2 - 1 0 2-3-0-1 2-3-0-1 4 - 1 1 3-0-1-2 3-2-1-0 0 0 0 0-1-2-3-4-5-6-7 0-1-2-3-4-5-6-7 0 0 1 1-2-3-4-5-6-7-0 1-0-3-2-5-4-7-6 0 1 0 2-3-4-5-6-7-0-1 2-3-0-1-6-7-4-5 0 1 1 3-4-5-6-7-0-1-2 3-2-1-0-7-6-5-4 1 0 0 4-5-6-7-0-1-2-3 4-5-6-7-0-1-2-3 1 0 1 5-6-7-0-1-2-3-4 5-4-7-6-1-0-3-2 1 1 0 6-7-0-1-2-3-4-5 6-7-4-5-2-3-0-1 8 1 1 1 7-0-1-2-3-4-5-6 7-6-5-4-3-2-1-0 notes: 1. for a burst length of two, a1-a i selects the two-data -element block; a0 selects the first access within the block. 2. for a burst length of four, a2-a i selects the fo ur-data-element block; a0-a1 selects the first access within the block. 3. for a burst length of eight, a3-a i selects the ei ght-data- element block; a0-a2 selects the first access within the block. 4. whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block. burst type accesses within a given burst may be programmed to be eith er sequential or interleaved; this is referred to as the burst type and is selected via bit a3. the ordering of accesses within a burst is determined by the burst length, the burst type and the starting colu mn address, as shown in burst definition. read latency the read latency, or cas latency, is the delay, in clock cycles, between the registration of a read command and the availability of the first burst of output data. the latency can be programmed 2 or 2.5 clocks for ddr266/333 and 3 clocks for ddr400/450/500. if a read command is registered at clock edge n, and the latency is m clocks, the data is available nominally coincident with clock edge n + m. reserved states should not be used as unknown operatio n or incompatibility with future versions may result.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 12 ? rev 1.1 consumer dram jul. 2011 operating mode the normal operating mode is selected by issuing a mode register set command with bits a7-a12 to zero, and bits a0-a6 set to the desired values. a dll reset is initiated by issuing a mode register set command with bits a7 and a9-a12 each set to zero, b it a8 set to one, and bits a0-a6 set to the desired values. a mode register set command issued to reset the dll should always be followed by a mode register set command to select normal operating mode. all other combinations of values for a7-a12 are reserved for futu re use and/or test modes. test modes and reserved states shoul d not be used as unknown operation or incompat ibility with future versions may result. cas latencies
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 13 ? rev 1.1 consumer dram jul. 2011 extended mode register the extended mode register controls functions beyond those controlled by the mode register; these additional functions include dll enable/disable, bit a0; output drive strength selection, bit a1; and qfc output enable/disable, bit a2 (ntc optional). these functions are controlled via the bit settings shown in the extended mode register definition. the extended mode register is programmed via the mode register set command (with ba0 = 1 and ba1 = 0) and retains the stored information until it is programmed again or the device loses power. the extended mode register must be loaded when all banks are idle, and the controller must wait the specified time before initiating any subsequent operation. violating either of these requirements result in unspecified operation. dll enable/disable the dll must be enabled for normal operation. dll enable is required during power up initialization, and upon returning to normal operation after having disabled the dll for the purpose of debug or evaluation. the dll is automatically disabled when entering self refresh operation and is automatically re-enabled upon exit of self refresh operation. any time the dll is enabled, 200 clock cycles must occur to allow time for the internal clock to lock to the externally applied clock before a read command can be issued. this is the reason for introducing timing parameter txsrd for ddr sdram?s (exit self refresh to read command). non- read commands can be issued 2 clocks after the dll is enabled via the emrs command (tmrd) or 10 clocks after the dll is enabled via self refresh exit command (txsnr, exit self refresh to non-read command). output drive strength the normal drive strength for all outputs is specified to be sstl_2, class ii. qfc enable/disable (not support in this product; only for information) the qfc signal is an optional dram output control used to isolate module loads (dimms) from the system memory bus by means of external fet switches when the given module (dimm) is not being accessed. the qfc function is an optional feature for nanya and is not included on all ddr sdram devices.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 14 ? rev 1.1 consumer dram jul. 2011 extended mode register definition
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 15 ? rev 1.1 consumer dram jul. 2011 commands truth tables 1a and 1b provide a reference of the commands supported by ddr sdram devices. a verbal description of each command follows. truth table 1a commands name (function) cs ras cas we address mne notes deselect (nop) h x x x x nop 1,9 no operation (nop) l h h h x nop 1,9 active (select bank and activate row) l l h h bank / row act 1,3 read (select bank, column and start read burst) l h l h bank / col read 1,4 write (select bank, column and start write burst) l h l l bank / col write 1,4 burst terminate l h h l x bst 1,8 pre-charge (deactivate row in bank or banks) l l h l code pre 1,5 auto refresh or self refresh (enter self refresh mode) l l l h x ar/sr 1,6,7 mode register set l l l l op-code mrs 1,2 1. cke is high for all commands shown except self refresh. 2. ba0, ba1 select either the base or the extended mode register (ba0 = 0, ba1 = 0 selects mode register; ba0 = 1, ba1 = 0 sele cts extended mode register; other combinations of ba0-ba1 are reserv ed; a0-a12 provide the op-code to be written to the selected mo de register.) 3. ba0-ba1 provides bank address and a0-a12 provides row address. 4. ba0, ba1 provide bank address; a0-a i provide column address (where i = 9 for x8 and 9, 11 for x4); a10 high enables the auto precharge feature (non-persistent), a10 low disables the auto precharge feature. 5. a10 low: ba0, ba1 determine which bank is precharged. a10 high: all banks are precharged and ba0, ba1 are ?don?t care.? 6. this command is auto refresh if cke is high; self refresh if cke is low. 7. internal refresh counter controls row and bank addressing; all inputs and i/os are ?don?t care? except for cke. 8. applies only to read bursts with auto precharge disabled; this command is undefined (and should not be used) for read bursts with autoprecharge enabled or for write bursts. 9. deselect and nop are functionally interchangeable. truth table 1b: dm operation name (function) dm dqs note write enable l valid 1 write inhubit h x 1 1. used to mask write data; provided coincident with the corresponding data.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 16 ? rev 1.1 consumer dram jul. 2011 deselect the deselect function prevents new commands from being executed by the ddr sdram. the ddr sdram is effectively deselected. operations already in progress are not affected. no operation (nop) the no operation (nop) command is used to perform a nop to a ddr sdram. this prevents unwanted commands from being registered during idle or wait states. operations already in progress are not affected. mode register set the mode registers are loaded via inputs a0-a12, ba0 and ba1 while issuing the mode register set command. see mode register descriptions in the register definition section. the mode register set command can only be issued when all banks are idle and no bursts are in progress. a subsequent executable command cannot be issued until tmrd is met. active the active command is used to open (or activate) a row in a particular bank for a subsequent access. the value on the ba0, ba1 inputs selects the bank, and the address provided on inputs a0-a12 selects the row. this row remains active (or open) for accesses until a precharge (or read or write with auto precharge) is issued to that bank. a precharge (or read or write with auto precharge) command must be issued and completed before opening a different row in the same bank. read the read command is used to initiate a burst read access to an active (open) row. the value on the ba0, ba1 inputs selects the bank, and the address provided on inputs a0-ai, aj (where [i = 9, j = don?t care] for x8; where [i = 9, j = 11] for x4) sel ects the starting column location. the value on input a10 determines whether or not auto precharge is used. if auto precharge is selected, the row being accessed is precharged at the end of the read burst; if auto precharge is not selected, the row remains open for subsequent accesses. write the write command is used to initiate a burst write access to an active (open) row. the value on the ba0, ba1 inputs selects the bank, and the address provided on inputs a0-ai, aj (where [i = 9, j = don?t care] for x8; where [i = 9, j = 11] for x4) sel ects the starting column location. the value on input a10 determines whether or not auto precharge is used. if auto precharge is selected, the row being accessed is precharged at the end of the write burst; if auto precharge is not selected, the row remains open for subsequent accesses. input data appearing on the dqs is written to the memory array subject to the dm input logic level appearing coincident with the data. if a given dm signal is registered low, the corresponding data is written to memory; if the dm signal is registered high, the corresponding data inputs are ignored, and a write is not executed to that byte/column location. precharge the precharge command is used to deactivate (close) the open row in a particular bank or the open row(s) in all banks. the bank(s) will be available for a subsequent row access a specified time (trp) after the precharge command is issued. input a10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs ba0, ba1 select the bank. otherwise ba0, ba1 are treated as ?don?t care.? once a bank has been precharged, it is in the idle state and must be activated prior to any read or write commands being issued to that bank. a precharge command is treated as a nop if there is no open row in that bank, or if the previously open row is already in the process of precharging.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 17 ? rev 1.1 consumer dram jul. 2011 auto precharge auto precharge is a feature which performs the same individual-b ank precharge function described above, but without requiring a n explicit command. this is accomplished by using a10 to enable auto precharge in conjunction with a specific read or write command. a pre charge of the bank/row that is addressed with the read or write command is automatically performed upon completion of the read or writ e burst. auto precharge is non-persistent in that it is either enabled or disabled for each individual re ad or write command. auto prech arge ensures that the precharge is initiated at the ear liest valid stage within a burst. this is det ermined as if an explicit precharge comm and was issued at the earliest possible time without violating t ras (min). the user must not issue another comm and to the same bank until the precharge (t rp ) is completed. the ntc ddr sdram device supports the optional t ras lockout feature. this feature allows a read command with auto precharge to be issued to a bank that has been activated (opened) but has not yet satisfied the t ras (min) specification. the t ras lockout feature essentially delays the onset of the auto precharge operat ion until two conditions occur. one, t he entire burst length of data has been succ essfully prefetched from the memory array; and two, t ras (min) has been satisfied. as a means to specify whether a ddr sdram device supports the t ras lockout feature, a new parameter has been defined; t rap (ras command to read command with auto precharge or better stated bank activate to read command with auto precharge). for devices th at support the t ras lockout feature, t rap = t rcd (min). this allows any read comm and (with or without auto precharge) to be issued to an open bank once t rcd (min) is satisfied. t rap definition burst terminate the burst terminate command is used to truncate read bursts (with auto precharge disabled). the most re-cently registered read command prior to the burst terminate command is truncated, as shown in the operation section of this data sheet. write burst cycles are not to be terminated with the burst terminate command.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 18 ? rev 1.1 consumer dram jul. 2011 auto refresh auto refresh is used during normal operation of the ddr sdram and is analogous to cas before ras (cbr) refresh in previous dram types. this command is nonpersistent, so it must be issued each time a refresh is required. the refresh addressing is generated by the internal refresh controller. this makes the address bits ?don?t care? during an auto refresh command. the 512mb ddr sdram requires auto refresh cycles at an average periodic interval of 7.8ms (maximum). self refresh the self refresh command can be used to retain data in the ddr sdram, even if the rest of the system is powered down. when in the self refresh mode, the ddr sdram retains data without external clocking. the self refresh command is initiated as an auto refresh command coincident with cke transitioning low. the dll is automatically disabled upon entering self refresh, and is automatically enabled upon exiting self refresh (200 clock cycles must then occur before a read command can be issued). input signals except cke (low) are ?don?t care? during self refresh operation. the procedure for exiting self refresh requires a sequence of commands. ck (and ck) must be stable prior to cke returning high. once cke is high, the sdram must have nop commands issued for txsnr because time is required for the completion of any internal refresh in progress. a simple algorithm for meeting both refresh and dll requirements is to apply nops for 200 clock cycles before applying any other command.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 19 ? rev 1.1 consumer dram jul. 2011 operations bank/row activation before any read or write commands can be issued to a bank within the ddr sdram, a row in that bank must be ?opened? (activated) . this is accomplished via the active command and addresses a0-a12, ba0 and ba1 (see activating a specific row in a specific bank), wh ich decode and select both the bank and the row to be activated. a fter opening a row (issuing an active command), a read or write c ommand may be issued to that row, subject to the t rcd specification. a subsequent active command to a different row in the same bank can only be issued after the previous active row has been ?closed? (prechar ged). the minimum time interval between successive active comman ds to the same bank is defined by t rc . a subsequent active command to another bank can be issued while the first bank is being accessed, which results in a reduction of total row-access overhead. the minimum ti me interval between successive active commands to different banks is defined by t rrd . activating a specific row in a specific bank t rcd and t rrd definition
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 20 ? rev 1.1 consumer dram jul. 2011 reads subsequent to programming the mode register with cas latency, burst type, and burst length, read bursts are initiated with a re ad command. the starting column and bank addresses are provided with the read command and auto precharge is either enabled or disabled for that burst access. if auto precharge is enabled, the row that is accessed starts precharge at the completion of the burst, prov ided t ras has been satisfied. for the generic read commands used in the following illustrations, auto precharge is disabled. during read bursts, the valid data-out elem ent from the starting column address is available following the cas latency after th e read command. each subsequent data-out element is valid nominally at the next positive or negative clock edge (i.e. at the next cros sing of ck and ck). the following timing figure entitled ?read burst: cas latencies (burst length=4)? illustrates the general timing for each supported cas latency setting. dqs is driven by the ddr sdra m along with output data. the initial low state on dqs is know n as the read preamble; the low state coincident with the last data -out element is known as the r ead postamble. upon completion o f a burst, assuming no other commands have been initiated, the dqs and dqs goes high-z. data from any read burst may be concatenated with or truncated with data from a subsequent read command. in either case, a continuous flow of data can be maintained. the first data element from the new burst follows ei ther the last element of a completed burst or the last desired data element of a longer burst which is being truncated. the new r ead command should be issued x cycles after the first read command , where x equals the number of desired data el ement pairs (pairs are required by the 2n pr efetch architecture). this is shown in timing figure entitled ?consecutive read bursts: c as latencies (burst length =4 or 8)?. a re ad command can be initiated on any positiv e clock cycle following a previous read command. nonconsecutive re ad data is shown in timing figure entitled ?non-consecutive read bursts: cas latencies (burst length = 4)?. full-speed random read accesses: cas latencies (burst length = 2, 4 or 8) within a page (or pages) can be performed. read command
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 21 ? rev 1.1 consumer dram jul. 2011 read burst: cas latencies (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 22 ? rev 1.1 consumer dram jul. 2011 consecutive read bursts: cas latencies (burst length = 4 or 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 23 ? rev 1.1 consumer dram jul. 2011 non-consecutive read bursts: cas latencies (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 24 ? rev 1.1 consumer dram jul. 2011 random read accesses: cas latencies (burst length = 2, 4 or 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 25 ? rev 1.1 consumer dram jul. 2011 data from any read burst may be truncated with a burst terminate command, as shown in timing figure entitled terminating a read burst: cas latencies (burst length = 8) on page 29. the burst terminate latency is equal to the read (cas) latency, i.e. the burst terminate command should be issued x cycles after the read command, where x equals the number of desired data element pairs. data from any read burst must be completed or truncated before a subsequent write command can be issued. if truncation is necessary, the burst terminate command must be used, as shown in timing figure entitled read to write: cas latencies (burst length = 4 or 8) on page 30. the example is shown for t dqss (min). the t dqss (max) case, not shown here, has a longer bus idle time. t dqss (min) and t dqss (max) are defined in the section on writes. a read burst may be followed by, or truncated with, a precharge command to the same bank (provided that auto precharge was not activated). the precharge command should be issued x cycles after the read command, where x equals the number of desired data element pairs (pairs are required by the 2n prefetch architecture). this is shown in timing figure on page 24 for read latencies of 3. following the precharge command, a subsequent command to the same bank cannot be issued until t rp is met. note that part of the row precharge time is hidden during the access of the last data elements. in the case of a read being executed to completion, a precharge command issued at the optimum time (as described above) provides the same operation that would result from the same read burst with auto precharge enabled. the disadvantage of the precharge command is that it requires that the command and address busses be available at the appropriate time to issue the command. the advantage of the precharge command is that it can be used to truncate bursts.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 26 ? rev 1.1 consumer dram jul. 2011 terminating a read burst: cas latencies (burst length = 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 27 ? rev 1.1 consumer dram jul. 2011 read to write: cas latencies (burst length = 4 or 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 28 ? rev 1.1 consumer dram jul. 2011 read to precharge: cas latencies (burst length = 4 or 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 29 ? rev 1.1 consumer dram jul. 2011 writes write bursts are initiated with a writ e command, as shown in timing figure write command on this page. the starting column and bank addresses are provided with the wr ite command, and auto precharge is either enabled or disabled fo r that access. if auto precharge is enabled, the row being accesse d is precharged at the completion of the burst. for the generic write commands used in the following illustrations, auto precharge is disabled. during write bursts, the first valid data-in element is register ed on the first rising edge of dqs following the write command, and subsequent data elements are registered on successive edges of dqs. the low state on dqs between the write command and the first rising edge is known as the write preamble; the low state on dqs following the last data-in element is known as the write postamble. the time between the write command an d the first corresponding rising edge of dqs (t dqss ) is specified with a relatively wide range (from 75% to 125% of one clock cycle), so most of th e write diagrams that follow ar e drawn for the two extreme cases (i.e. t dqss (min) and t dqss (max)). timing figure write burst (burst length = 4) on page 34 shows the two extremes of t dqss for a burst of four. upon completion of a burst, assuming no other commands have been initiated, the dqs and dqs enters high-z and any additional input data is ignored. data for any write burst may be concatenated with or truncated with a subsequent write command. in either case, a continuous fl ow of input data can be maintained. the new write command can be is sued on any positive edge of clock following the previous write command. the first data element from the new burst is applied after either the last el ement of a completed burst or the last de sired data element of a longer burst which is being truncated. the new writ e command should be issued x cycles after the first write comma nd, where x equals the number of desired data element pairs (pairs are required by th e 2n prefetch architecture). timing figure write to write (burst length = 4) on page 35 shows concatenated bursts of 4. an exam ple of nonconsecutive writes is shown in timing figure write to write: max dqss, non- consecutive (burst length = 4) on page 36. fullspeed random write accesses within a page or pages can be performed as shown in timing figure random write cycles (burst length = 2, 4 or 8) on page 37. data for any write burst may be followed by a subsequent read command. to follo w a write without truncating the write burst, t wtr (write to read) should be met as shown in timing figure write to read: non-interrupting (c as latency = 3; burst length = 4) . data for any write burst may be truncated by a subsequent (interrupting) read command. this is illustrated in timing figures ?w rite to read: interrupting (cas latency =2; burst le ngth = 8)?, ?write to read: minimum d qss , odd number of data (3 bit write), interrupting (cas latency = 2; burst length = 8)?, and ?write to read: nominal d qss , interrupting (cas latency = 2; burst length = 8)?. note that only the data-in pairs that are registered prior to the t wtr period are written to the internal array, and any subsequent data-in must be masked with dm, as shown in the diagrams noted previously. data for any write burst may be followed by a subsequent precha rge command. to follow a write wi thout truncating the write burs t, t wr should be met as shown in timing figure write to precharge: non-in terrupting (burst length = 4). data for any write burst may be truncated by a subs equent precharge command, as shown in timing figures write to precharge: interrupting (burst length = 4 or 8) on page 43 to write to precharge: nominal dqss (2 bit wr ite), interrupting (burst length = 4 or 8) . note that only the data-in pairs th at are registered prior to the t wr period are written to the internal array, and any subsequent data in should be masked with dm. following the precharge command, a subsequent command to the same bank cannot be issued until t rp is met. in the case of a write burst being executed to completion, a pr echarge command issued at the optimum time (as described above) provides the same operation that would result from the same bu rst with auto precharge. the disadvantage of the precharge comman d is that it requires that the command and address busses be availa ble at the appropriate time to issue the command. the advantag e of the precharge command is that it can be used to truncate bursts.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 30 ? rev 1.1 consumer dram jul. 2011 write command
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 31 ? rev 1.1 consumer dram jul. 2011 write burst (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 32 ? rev 1.1 consumer dram jul. 2011 write to write (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 33 ? rev 1.1 consumer dram jul. 2011 write to write: max dqss, non-consecutive (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 34 ? rev 1.1 consumer dram jul. 2011 random write cycles (burst length = 2, 4 or 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 35 ? rev 1.1 consumer dram jul. 2011 write to read: non-interrupting (cas latency = 3; burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 36 ? rev 1.1 consumer dram jul. 2011 write to read: interrupting (cas latency = 3; burst length = 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 37 ? rev 1.1 consumer dram jul. 2011 write to read: minimum dqss, odd number of data (3 bit write), interrupting (cas latency = 3; burst length = 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 38 ? rev 1.1 consumer dram jul. 2011 write to read: nominal dqss, interrupting (cas latency = 3; burst length = 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 39 ? rev 1.1 consumer dram jul. 2011 write to precharge: non-interrupting (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 40 ? rev 1.1 consumer dram jul. 2011 write to precharge: interrupting (burst length = 4 or 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 41 ? rev 1.1 consumer dram jul. 2011 write to precharge: minimum dqss, odd number of data (1 bit write), interrupting (burst length = 4 or 8) write to precharge: nominal dqss (2 bit write), interrupting (burst length = 4 or 8)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 42 ? rev 1.1 consumer dram jul. 2011 precharge command precharge the precharge command is used to deactivate the open row in a particular bank or the open row in all banks. the bank(s) is available for a subsequent row access some specified time (t rp ) after the precharge command is issued. input a10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs ba0, ba1 select the bank. when all banks are to be precharged, inputs ba0, ba1 are treated as ?don?t care.? once a bank has been precharged, it is in the idle state and must be activated prior to any read or write commands being issued to that bank. power down power down is entered when cke is registered low (no accesses can be in progress). if power down occurs when all banks are idle, this mode is referred to as precharge power down; if power down occurs when there is a row active in any bank, this mode is referred to as active power down. entering power down deactiva tes the input and output buffers, excluding ck, ck and cke. the dll is still running in power down mode, so for maximum power savings, the user has the option of disabling the dll prior to entering power down. in that case, the dll must be enabled after exiting power down, and 200 clock cycles must occur before a read command can be issued. in power down mode, cke low and a stable clock signal must be maintained at the inputs of the ddr sdram, and all other input signals are ?don?t care?. however, power down duration is limited by the refresh requirements of the device, so in most applications, the self refresh m ode is preferred over the dll-disabled power down mode. the power down state is synchronously exited when cke is regi stered high (along with a nop or deselect command). a valid, executable command may be applied one clock cycle later.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 43 ? rev 1.1 consumer dram jul. 2011 truth table 2: clock enable (cke) 1. cke n is the logic state of cke at clock edge n: cke n-1 was the state of cke at the previous clock edge. 2. current state is the state of the ddr sdram immediately prior to clock edge n. 3. command n is the command registered at clock ed ge n, and action n is a result of command n. 4. all states and sequences not shown are illegal or reserved. cke n-1 cken current state previous cycle current cycle command n action n notes self refresh l l x maintain self-refresh self refresh l h deselect or nop exit self-refresh power down l l x maintain power down power down l h deselect or nop exit power down all banks idle h l deselect or nop precharge power down entry all banks idle h l auto refresh self refresh entry bank(s) active h l deselect or nop active power down entry h h see truth table 3 1. deselect or nop commands should be issued on any clock edges occurring during the self refresh exit (t xsnr ) period. a minimum of 200 clock cycles are needed before applying a read command to allow the dll to lock to the input clock.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 44 ? rev 1.1 consumer dram jul. 2011 truth table 3: current state banks n ? command to bank n (same bank) current state cs ras cas we command action notes h x x x deselect nop. continue previous operation any l h h h no operation nop. continue previous operation l l h h active select and activate row l l l h auto refresh auto refresh 7 idle l l l l mode register set mode register set 7 l h l h read select column and start read burst 10 l h l l write select column and start write burst 10 row active l l h l precharge deactivates row in bank(s) 8 l h l h read select column and start new read burst 10 l h l l write select column and start new write burst 10,12 l l h l precharge truncate read burst, start precharge 8 read (auto precharge disabled) l h h l burst termination burst terminate 9 l h l h read select column and start read burst 10,11 l h l l write select column and start write burst 10 write (auto precharge disabled) l l h l precharge truncate write burst, start precharge) 8,11 1. this table applies when cke n-1 was high and cke n is high (see truth table 2: clock enable (cke) and after txsnr / txsrd ha s been met (if the previous state was self refresh). 2. this table is bank-specific, except where noted, i.e., the current state is for a specific bank and the commands shown are t hose allowed to be issued to that bank when in that state. exceptions are covered in the notes below. 3. current state definitions: idle: the bank has been precharged, and trp has been met. row active : a row in the bank has been activated, and trcd has been met. no data bursts/accesses and no register accesses are in progress . read: a read burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated. write : a write burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated. 4. the following states must not be interrupted by a command issued to the same bank. deselect or nop commands, or allowable co mmands to the other bank should be issued on any clock edge occurring during these states. allowable commands to the other bank are deter mined by its current state and truth table 3, and according to truth table 4. precharging: starts with registration of a precharge command and ends when trp is met. once trp is met, the bank is in the idle state. row activating: starts with registration of an active command and ends when trcd is met. once trcd is met, the bank is in the ?row active? state. read w/auto precharge enabled: starts with registration of a read command with auto precharge enabled and ends when trp has been met. once trp is met, the bank is in the idle state. write w/auto precharge enabled: starts with registration of a write command with auto precharge enabled and ends when trp has been met. once trp is met, the bank is in the idle state. 5. the following states must not be interrupted by any executable command; deselect or nop commands must be applied on each pos itive clock edge during these states. refreshing: starts with registration of an auto refresh command and ends w hen trfc is met. once trfc is met, the ddr sdram is in the ?all banks idle? state. accessing mode register: starts with registration of a mode register set command and ends when tmrd has been met. once tmrd is met, the ddr sdram is in the ?all banks idle? state. precharging all: starts with registration of a precharge all command and ends when trp is met. once trp is met, all banks is in the idle state. 6. all states and sequences not shown are illegal or reserved. 7. not bank-specific; requires that all banks are idle. 8. may or may not be bank-specific; if all/any banks are to be precharged, all/any must be in a valid state for precharging. 9. not bank-specific; burst terminate affects the most recent read burst, regardless of bank. 10. reads or writes listed in the command/action column include reads or writes with auto precharge enabled and reads or writes with auto precharge disabled. 11. requires appropriate dm masking. 12. a write command may be applied after the completion of the read burst; otherwise, a burst terminate must be used to end the read prior to asserting a write command, 13 operation or timing that is not specified is illegal and after such an event, in order to guarantee proper operation, the dr am must be powered down and then restarted through the specified initialization sequence before normal operation can continue.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 45 ? rev 1.1 consumer dram jul. 2011 truth table 4: current state banks n ? command to bank m (different bank) current state cs ras cas we command action notes h x x x deselect nop. continue previous operation any l h h h no operation nop. continue previous operation idle x x x x any command otherwise allowed to bank m l l h h active select and active row l h l h read select column and start read burst 7 l h l l write select column and start write burst 7 row activating, active or precharge l l h l precharge l l h h active select and activate row l h l h read select column and start new read burst 7 l h l l write select column and start new write burst 7,9 read (auto precharge disabled) l l h l precharge l l h h active select and active row l h l h read select column and start read burst 7,8 l h l l write select column and start write burst 7 write (auto precharge disabled) l l h l precharge l l h h active select and active row l h l h read select column and start read burst 3a,7 l h l l write select column and start write burst 3a,7,9 read (with auto precharge) l l h l precharge l l h h active select and active row l h l h read select column and start read burst 3a,7 l h l l write select column and start write burst 3a,9 write (with auto precharge) l l h l precharge
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 46 ? rev 1.1 consumer dram jul. 2011 1. this table applies when cke n-1 was high and cke n is high (see truth table 2: clock enable (cke) and after txsnr / txsrd ha s been met (if the previous state was self refresh). 2. this table describes alternate bank operation, except where noted, i.e., the current state is for bank n and the commands sh own are those allowed to be issued to bank m (assuming that bank m is in such a state that the given command is allowable). exceptions are co vered in the notes below. 3. current state definitions: idle: the bank has been precharged, and trp has been met. row active : a row in the bank has been activated, and trcd has been met. no data bursts/accesses and no register accesses are in progress. read: a read burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated. write : a write burst has been initiated, with auto precharge disabled, and has not yet terminated or been terminated. read with auto precharge enable: see following text, notes 3a, 3b, and 3c: write with auto precharge enable: see following text, notes 3a, 3b, and 3c: 3a. for devices which do not support the optional ?concurrent auto precharge? feature, the read with auto precharge enabled or write with auto precharge enabled states can each be broken into two parts: the access period and the precharge period. for read with auto precharge, the precharge period is defined as if the same burst was executed with auto precharge disabled and then followed with the earli est possible precharge command that still accesses all of the data in the burst. for write with auto precharge, the precharge period begins when twr ends, with twr measured as if auto precharge was disabled. the access period starts with registration of the command and ends w here the precharge period (or trp) begins. during the precharge period of the read with auto precharge enabled or write with auto precha rge enabled states, active, precharge, read and write commands to the other bank may be applied; during the access period, only active and precharge commands to the other bank may be applied. in either case, all other related limitations apply (e.g., contention betw een read data and write data must be avoided). 3b. for devices which do support the optional ?concurrent auto precharge? feature, a read with auto precharge enabled, or a write with auto precharge enabled, may be followed by any command to the other banks, as long as that command does not interrupt the read or wr ite data transfer, and all other related limitations apply (e.g., contention between read data and write data must be avoided.) 3c. the minimum delay from a read or write command with auto precharge enable, to a command to a different bank, is summarized bel ow, for both cases of ?concurrent auto precharge,? supported or not: from command to command (different bank) minimum delay without concurrent auto precharge support minimum delay withconcurrent auto precharge support units read or read w/ap 1+(bl/2) + (twr/tck) (rounded up) 1+(bl/2) + twtr write or write w/ap 1+(bl/2) + (twr/tck) (rounded up) bl/2 write w/ap precharge or activate 1 read or read w/ap bl/2 write or write w/ap cl (rounded up) + (bl/2) read w/ap precharge or activate 1 tck 4. auto refresh and mode register set commands may only be issued when all banks are idle. 5. a burst terminate command cannot be issued to another bank; it applies to the bank represented by the current state only. 6. all states and sequences not shown are illegal or reserved. 7. reads or writes listed in the command/action column include reads or writes with auto precharge enabled and reads or writes with auto precharge disabled. 8. requires appropriate dm masking. 9. a write command may be applied after the completion of data output, otherwise a burst terminate must be used to the read pri or to asserting a write command.. 10. operation or timing that is not specified is illegal and after such an event, in order to guarantee proper operation, the d ram must be powered down and then restarted through the specified initialization sequence before normal operation can continue.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 47 ? rev 1.1 consumer dram jul. 2011
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 48 ? rev 1.1 consumer dram jul. 2011 simplified state diagram
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 49 ? rev 1.1 consumer dram jul. 2011 absolute maximum ratings symbol parameter rating units vin, vout voltage on i/o pins relative to vss -0.5 to vddq+ 0.5 v vin voltage on inputs relative to vss -1.0 to +3.6 v vdd voltage on vdd supply relative to vss -1.0 to +3.6 v vddq voltage on vddq supply relative to vss -1.0 to +3.6 v ta operating temperature (ambient) 0 to +70 
tstg storage temperature (plastic) -55 to +150 
pd power dissipation 1.0 w iout short circuit output current 50 ma note: stresses greater than those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only, and functional operati on of the device at these or any other conditions above those indicated in the operational sections of this specificat ion is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. capacitance paramester symbol min. max. units notes input capacitance: ck, ck ci1 2.0 3.0 pf 1 delta input capacitance: ck, ck delta ci1 - 0.25 pf 1 input capacitance: all other input-only pins (except dm) ci2 2.0 3.0 pf 1 delta input capacitance: all other input-only pins (except dm) delta ci2 - 0.5 pf 1 input/output capacitance: dq, dqs, dm cio 4.0 5.0 pf 1,2 delta input/output capacitance: dq, dqs, dm delta cio - 0.5 pf 1 1. vddq = vdd = 2.5v 0.2v(ddr266/333); 2.6v 0.1v(ddr400/450/500) (minimum range to maximum range), f = 100mhz, ta = 25c, vodc = vddq/2, vopeak -peak = 0.2v. 2. although dm is an input-only pin, t he input capacitance of this pin must model the input capacitance of the dq and dqs pins. this is required to match input prop agation times of dq, dqs and dm in the system.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 50 ? rev 1.1 consumer dram jul. 2011 dc electrical characteristics and operating conditions symbol paramester min max units note s ddr 266/333 ddr 400/450/500 vdd supply voltage 2.3 2.5 2.7 v 1 vddq i/o supply voltage 2.3 2.5 2.7 v 1 vref i/o reference voltage 0.49 x vddq 0.51 x vddq v 1,2 vtt i/o termination voltage (system) vref - 0.04 vref + 0.04 v 1,3 vih(dc) input high (logic1) voltage vref + 0.15 vddq + 0.3 v 1 vil(dc) input low (logic0) voltage - 0.3 vref - 0.15 v 1 vin(dc) input voltage level, ck and ck inputs - 0.3 vddq + 0.3 v 1 vid(dc) input differential voltage, ck and ck inputs 0.36 vddq + 0.6 v 1,4 vix(dc) input crossing point voltage, ck and ck inputs 0.30 vddq + 0.6 v 1,4 viratio v-i matching pullup current to pulldown current ratio 0.71 1.4 5 ii input leakage current any input 0v vin vdd; (all other pins not under test = 0v) -2 2 a ioz output leakage current (dqs are disabled; 0v vout vddq -5 5 a 1 ioh -16.2 iol output current: nominal strength driver high current (vout= vddq -0.373v, min vref, min vtt) low current (vout= 0.373v, max vref, max vtt) 16.2 ma 1 1. inputs are not recognized as valid until v ref stabilizes. 2. v ref is expected to be equal to 0.5 v ddq of the transmitting device, and to track variations in the dc level of the same. peak-to-peak noise on v ref may not exceed 2% of the dc value. 3. v tt is not applied directly to the device. v tt is a system supply for signal termination resistors, is expected to be set equal to v ref , and must track variations in the dc level of v ref . 4. v id is the magnitude of the difference between the input level on ck and the input level on ck. 5. the ratio of the pullup current to the pulldown current is specified for the same temperature and voltage, over the entire t emperature and voltage range, for device drain to source voltages for 0.25 volts to 1.0 volts. for a given output, it represents the maximum d ifference between pullup and pulldown drivers due to process variation.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 51 ? rev 1.1 consumer dram jul. 2011 normal strength driver pulldown and pullup characteristics 1. the full variation in driver pulldown current from minimum to maximum process, temperature an d voltage will lie within the o uter bounding lines of the v-i curve. 2. it is recommended that the ?typical? ibis pulldown v-i curve lie within the shaded region of the v-i curve. 3. the full variation in driver pullup curr ent from minimum to maximum process, temp erature and voltage will lie within the out er bounding lines of the v-i curve. 4. it is recommended that the ?typical? ibis pullup v-i curve lie within the shaded region of the v-i curve. 5. the full variation in the ratio of the maximum to minimum pullup and pulldown current will not exceed 1.7, for device drain to source voltages from 0.1 to 1.0. 6. the full variation in the ratio of the ?typical? ibis pullup to ?typical? ibis pulldown current should be unity + 10%, for d evice drain to source voltages from 0.1 to 1.0. this specificatio n is a design objective only. it is not guaranteed. 7. these characteristics are intended to obey the sstl_2 class ii standard. 8. this specification is intended for ddr sdram only.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 52 ? rev 1.1 consumer dram jul. 2011 normal strength driver pulldown and pullup currents pull down current (ma) pullup current (ma) voltage (v) typical low typical high min max typical low typical high min max 0.1 6.0 6.8 4.6 9.6 -6.1 -7.6 -4.6 -10.0 0.2 12.2 13.5 9.2 18.2 -12.2 -14.5 -9.2 -20.0 0.3 18.1 20.1 13.8 26.0 -18.1 -21.2 -13.8 -29.8 0.4 24.1 26.6 18.4 33.9 -24.0 -27.7 -18.4 -38.8 0.5 29.8 33.0 23.0 41.8 -29.8 -34.1 -23.0 -46.8 0.6 34.6 39.1 27.7 49.4 -34.3 -40.5 -27.7 -54.4 0.7 39.4 44.2 32.2 56.8 -38.1 -46.9 -32.2 -61.8 0.8 43.7 49.8 36.8 63.2 -41.1 -53.1 -36.0 -69.5 0.9 47.5 55.2 39.6 69.9 -43.8 -59.4 -38.2 -77.3 1.0 51.3 60.3 42.6 76.3 -46.0 -65.5 -38.7 -85.2 1.1 54.1 65.2 44.8 82.5 -47.8 -71.6 -39.0 -93.0 1.2 56.2 69.9 46.2 88.3 -49.2 -77.6 -39.2 -100.6 1.3 57.9 74.2 47.1 93.8 -50.0 -83.6 -39.4 -108.1 1.4 59.3 78.4 47.4 99.1 -50.5 -89.7 -39.6 -115.5 1.5 60.1 82.3 47.7 103.8 -50.7 -95.5 -39.9 -123.0 1.6 60.5 85.9 48.0 108.4 -51.0 -101.3 -40.1 -130.4 1.7 61.0 89.1 48.4 112.1 -51.1 -107.1 -40.2 -136.7 1.8 61.5 92.2 48.9 115.9 -51.3 -112.4 -40.3 -144.2 1.9 62.0 95.3 49.1 119.6 -51.5 -118.7 -40.4 -150.5 2.0 62.5 97.2 49.4 123.3 -51.6 -124.0 -40.5 -156.9 2.1 62.9 99.1 49.6 126.5 -51.8 -129.3 -40.6 -163.2 2.2 63.3 100.9 49.8 129.5 -52.0 -134.6 -40.7 -169.6 2.3 63.8 101.9 49.9 132.4 -52.2 -139.9 -40.8 -176.0 2.4 64.1 102.8 50.0 135.0 -52.3 -145.2 -40.9 -181.3 2.5 64.6 103.8 50.2 137.3 -52.5 -150.5 -41.0 -187.6 2.6 64.8 104.6 50.4 139.2 -52.7 -155.3 -41.1 -192.9 2.7 65.0 105.4 50.5 140.8 -52.8 -160.1 -41.2 -198.2 normal strength driver evaluation conditions item typical minimum maximum temperature (t ambient ) 25 
70 
0 
v ddq 2.5v 2.3v 2.7v process conditions typical process slow-slow process fast-fast process
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 53 ? rev 1.1 consumer dram jul. 2011 ac characteristics (notes 1-5 apply to the following tables; electrical characteri stics and dc operating conditions, ac operating conditions, i dd specifications and conditions, and electr ical characteristics and ac timing.) 1. all voltages referenced to v ss . 2. tests for ac timing, i dd , and electrical, ac and dc characteristics, may be c onducted at nominal refere nce/supply voltage levels, but the related specifications and device operation are guaranteed for the full voltage range specified. 3. outputs measured with equivalent load. re fer to the ac output load circuit below. 4. ac timing and i dd tests may use a v il to v ih swing of up to 1.5v in the test environment, but input timing is still referenced to v ref (or to the crossing point for ck, ck), and parameter specifications are guaranteed for the specified ac input levels under norm al use conditions. the minimum slew rate for the i nput signals is 1v/ns in the range between v il(ac) and v ih(ac) . 5. the ac and dc input level specifications are as defined in t he sstl_2 standard (i.e. the receiver effectively switches as a result of the signal crossing the ac input level, and remains in that st ate as long as the signal does not ring back above (below) the dc input low (high) level. ac output load circuit diagrams ac input operating conditions (0 c t a 70 c ; v ddq = v dd = + 2.5v 0.2v (ddr266/333); + 2.6v 0.1v (ddr400/450/500); symbol parameter / condition min max unit note v ih(ac) input high (logic 1) voltage, dq, dqs, and dm signals v ref + 0.31 - v 1,2 v il(ac) input low (logic 0) voltage, dq, dqs, and dm signals - v ref ? 0.31 v 1,2 v id(ac) input differential voltage, ck and ck inputs 0.7 v ddq + 0.6 v 1,2,3 v ix(ac) input crossing point voltage, ck and ck inputs 0.5*v ddq ? 0.2 0.5*v ddq + 0.2 v 1,2,4 1. input slew rate = 1v/ns. 2. inputs are not recognized as valid until v ref stabilizes. 3. v id is the magnitude of the difference between the input level on ck and the input level on ck. 4. the value of v ix is expected to equal 0.5*v ddq of the transmitting device and must track variations in the dc level of the same.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 54 ? rev 1.1 consumer dram jul. 2011 i dd specifications and conditions (0 c t a 70 c ; v ddq = v dd = + 2.5v 0.2v (ddr266/333); + 2.6v 0.1v (ddr400/450/500);; see ac characteristics) ddr333 ddr400 ddr500 -6k/6ki -5t/5ti -4t symbol parameter/condition i/o typ max typ max typ max unit notes idd0 operating current : one bank; active / precharge; trc = trc (min); dq, dm, and dqs inputs changing twice per clock cycle; address and control inputs changing once per clock cyc x8 x16 53 61 61 67 61 69 70 75 tbd tbd ma 1,2 idd1 operating current : one bank; active / read / precharge; burst = 2; t rc = t rc (min); cl = 2.5; i out = 0ma; address and control inputs changing once per clock cycle x8 x16 48 55 56 63 54 63 64 71 tbd tbd ma 1,2 idd2p precharge power down standby current : all banks idle; power down mode; cke v il (max) all 4 9 ? 4 10 tbd tbd ? ma 1 idd2f idle standby current: cs v ih (min); all banks idle; cke 3 v ih (min); address and control inputs changing once per clock cycle all 22 27 24 29 tbd tbd ? ma 1 idd2q precharge floating standby current: cs v ih (min); all banks idle; cke v ih (min); address and control inputs changing once per clock cycle all 17 27 18 28 tbd tbd ? ma 1 idd3p active power down standby current : one bank active; power down mode; cke v il (max) all 9 14 10 15 tbd tbd ? ma 1 idd3n active standby current : one bank; active / precharge; cs v ih (min);cke v ih (min); t rc = t ras (max); dq, dm, and dqs inputs changing twice per clock cycle; address and control inputs changing once per clock cycle x8 x16 27 33 33 39 30 38 36 43 tbd tbd ma 1,2 idd4r operating current: one bank; burst = 2; reads; continuous burst; address and control inputs changing once per clock cycle; dq and dqs outputs changing twice per clock cycle; cl = 2.5; i out = 0ma x8 x16 57 68 69 88 66 78 78 97 tbd tbd ma 1,2 idd4w operating current : one bank; burst = 2; writes; continuous burst; address and control inputs changing once per clock cycle; dq and dqs inputs changing twice per clock cycle; cl = 2.5 x8 x16 58 65 68 76 66 73 77 90 tbd tbd ma 1,2 idd5 auto-refresh current : t rc = t rfc (min) all 104 112 108 192 tbd tbd ? ma 1 idd6 self-refresh current : cke 0.2v all 4 9 ? 4 10 tbd tbd ? ma 1 idd7 operating curren t: four bank; four bank interleaving with bl = 4, address and control inputs randomly changing; 50% of data changing at every transfer; t rc = t rc (min); i out = 0ma. x8 x16 160 177 187 250 186 205 218 290 tbd tbd ma 1,2 1. i dd specifications are tested after the device is properly initialized. 2. enables on-chip refresh and address counters. values are averaged from high and low temp values using x16 devices.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 55 ? rev 1.1 consumer dram jul. 2011 electrical characteristics & ac timing - absolute specifications (0 c t a 70 c commercial grade ; ?4 0c t a 95 c industrial grade v ddq = v dd = + 2.5v 0.2v (ddr266/333); + 2.6v 0.1v (ddr400/450/500) ; see ac characteristics) ddr266 (-75a/-75i) ddr333 (-6k/-6ki) ddr400 (-5t/-5ti) ddr450 (-45) ddr500 (-5t) symbol parameter min max min max min max min max min max unit notes tac dq output access time from ck/ck ?? 0.75 ? + ? 0.75 ??? 0.70 ? 0.7 ??? 0.70 ? + ? 0.7 ??? 0.65 ? 0.65 ??? 0.70 ? 0.7 ? ns  tdqsck dqs output access time from ck/ck ?? 0.75 ? + ? 0.75 ??? 0.60 ? + ? 0.60 ??? 0.60 ? + ? 0.60 ??? 0.65 ? 0.65 ??? 0.7 ? 0.7 ? ns  tch ck high-level width 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 tck  tcl ck low-level width 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 0.45 0.55 tck  thp ck half period min (tcl, tch)  min (tcl, tch)  min (tcl, tch)  min (tcl, tch)  min (tcl, tch)  ns  5 7.5 5 7.5 5 7.5 7.5 12 6 12 ? 6 12 ? 6 12 ? 6 12 ? tck clock cycle time cl=3 cl=2.5 cl=2 7.5 12 7.5 12 ? 7.5 12 ? 7.5 12 ? 7.5 12 ? ns 3 tdh dq and dm input hold time 0.5  ? 0.45  ? 0.4  ? 0.4  ? 0.4  ? ns 4 tds dq and dm input setup time 0.5  ? 0.45  ? 0.4  ? 0.4  ? 0.4  ? ns 4 tipw input pulse width 2.2  ? 2.2  ? 2.2  ? 2.2  ? 2.2  ? ns 5 tdipw dq and dm input pulse width (each input) 1.75  ? 1.75  ? 1.75  ? 1.75  ? 1.75  ? ns 5 thz data-out high-impedance time from ck/ck  ? 0.75 ?  ? 0.7 ?  ? 0.7 ?  ? 0.7 ?  ? 0.7 ? ns 6 tlz data-out low-impedance time from ck/ck ?? 0.75 ? 0.75 ??? 0.7 ? 0.7 ??? 0.7 ? 0.7 ??? 0.7 ? 0.7 ??? 0.7 ? 0.7 ? ns 6 dqs-dq skew (dqs & associated dq signa)-tsop  ? 0.5 ?  ? 0.45 ?  ? 0.4 ?  ? 0.5 ?  ? 0.4 ? ns  tdqsq dqs-dq skew (dqs & associated dq signals)-bga  ? 0.5 ?  ? 0.4 ?  ? 0.4 ?  ? 0.5 ?  ? 0.4 ? ns  tqh data output hold time from dqs thp - tqhs  ? thp - tqhs  ? thp - tqhs  ? thp - tqhs  ? thp - tqhs  ? ns  tqhs data hold skew factor-tsop  0.75  0.55  0.5  0.5  0.4 ns  tdqss write command to 1st dqs latching 0.75 1.25 0.75 1.25 0.72 1.25 0.75 1.25 0.85 1.15 tck  tdqsh dqs input high pulse width (write cycle) 0.35  ? 0.35  ? 0.35  ? 0.4  ? 0.4  ? tck  tdqsl dqs input low pulse width (write cycle) 0.35  ? 0.35  ? 0.35  ? 0.4  ? 0.4  ? tck  tdss dqs falling edge to ck setup time (write cycle) 0.2  ? 0.2  ? 0.2  ? 0.2  ? 0.2  ? tck  tdsh dqs falling edge hold time from ck (write cycle) 0.2  ? 0.2  ? 0.2  ? 0.2  ? 0.2  ? tck  tmrd mode register set command cycle time 2  ? 2  ? 2  ? 2  ? 2  ? tck  twpres write preamble setup time 0  ? 0  ? 0  ? 0  ? 0  ? ns  twpst write postamble 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 tck 9 twpre write preamble 0.25  ? 0.25  ? max(0.25 *tck, 1.5 ns)  ? 0.25  ? max(0.25 *tck, 1.5 ns)  ? ns 8 tih address and control input hold time (fast slew rate) 0.9  ? 0.75  ? 0.6  ? 0.75  ? 0.6  ? ns 5, 10-12 tis address and control input setup time (fast slew rate) 0.9  ? 0.75  ? 0.6  ? 0.75  ? 0.6  ? ns 5, 10-12 tih address and control input hold time (slow slew rate) 1  ? 0.8  ? 0.7  ? 0.8  ? 0.7  ? ns 5, 11-13 tis address and control input setup time (slow slew rate) 1  ? 0.8  ? 0.7  ? 0.8  ? 0.7  ? ns 5, 11-13 trpre read preamble 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 0.9 1.1 tck 14 trpres read preamble setup time (optional cl=1.5)  n/a  n/a  n/a  n/a  n/a ns  trpst read postamble 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 tck  tras active to precharge 45 120k 42 70k 40 70k 40 70k 40 70k ns  trc active to active/auto-refresh command period 60  ? 60  ? 55  ? 55  ? 55  ? ns  trfc auto-refresh to active/auto-refresh command period 75  ? 72  ? 70  ? 72  ? 70  ? ns  trcd active to read or write delay 20  ? 18  ? 15  ? 15  ? 15  ? ns  trp precharge command period 20  ? 18  ? 15  ? 15  ? 15  ? ns  trap active to read command with autoprecharge (trcd, tras)  ? (trcd, tras)  ? (trcd, tras)  ? (trcd, tras)  ? (trcd, tras)  ? ns  trrd active bank a to active bank b command 15  ? 12  ? 12  ? 15  ? 8  ? ns  twr write recovery time 15  ? 15  ? 15  ? 15  ? 15  ? ns  tdal auto precharge write recovery + precharge time --  ? --  ? --  ? --  ? --  ? tck 15 twtr internal write to read command delay 1  ? 1  ? 2  ? 2  ? 2  ? tck  txsnr exit self-refresh to non-read command 75  ? 75  ? 75  ? 75  ? 75  ? ns 16 txsrd exit self-refresh to read command 200  ? 200  ? 200  ? 200  ? 200  ? tck  trefi average periodic refresh interval  ? 7.8  ? 7.8  ? 7.8  ? 7.8  ? 7.8 s ? 4-17
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 56 ? rev 1.1 consumer dram jul. 2011 component notes 1. min (tcl, tch) referes to the smaller of the actual cloc k low time and actual clock high time as provided to the device. (i.e. this value can be greater than the minimum specification limits for tcl and tch). 2. tqh = thp - tqhs, where thp = minimum half clock period for any given cycle and is defined by clock high or clock low (tch, tcl). tqhs accounts for 1) the pulse duration distortion of on-chip clock circuits; and 2) the worst case push-out of dqs on one transition followed by the worst case pull-in of dq on the next transition, both of which are, separately, due to data pin skew and output pattern effects, and p-channel to n-channel variation of the output drivers. 3. the only time that the clock frequency is allowed to change is during self-refresh mode. 4. if refresh time or tds/tdh is viloated, data corruption may occur and the data must be re-written with valid data before a valid read can be executed. 5. these parameters quarantee device timing, but they are not necessarily tested on each device. they may be guaranteed by device design or tester correlation. 6. thz and tlz transitions occur in the same access time windows as valid data transitions. these arameters are reference to a specific voltage level that specifies when th e device output is no longer driving (thz) or begins driving (tlz) by measuring the signal at two different voltages. the actual voltage measurement points are not critical as long as the calculation is consistent. 7. tdqsq consists of datapin skew and output pattern effects and p-channel to n-channel variation of the output drivers for any given cycle. 8. the specific requirement is that dqs be valid (high, low, or at same point on a valid transition) on or before this ck edge. a valid transition is defined as monotonic and meeting the input slew rate specifications of the device. when no writes were previously in progress on the bus, dqs will be transitioning from high-z to logic low. if a previous write was in process, dqs could be high, low, or transitioning from high to low at this time, depending on dqss. 9. the maximum limit for this parameter is not a device limit. the device will operate with a greater value for this parameter, but system performance (bus turn-arround) will degrade accordingly. 10. for command/address input slew rate >= 1.0v/ns. 11. for ck & ck slew rate >= 1.0v/ns (single-ended). 12. slew rate is measured between voh(ac) and vol(ac). 13. for command/address input slew rate >= 0.5v/ns and <1.0v/ns. 14. trpst end point and trpre begin point are not reference to a specific voltage level but specify when the device output is no longer driving (trpre) by measuring the signal at two different voltages. the actual voltage measurement points are not critical as long as the calculation is consistent. 15. tdal = (twr/tck) + (trp/tck) 16. in all circumstances, txsnr can be satisfied using txsnr = trfcmin + 1*tck. 17. a maximum of eight auto refresh commands can be posted to any given ddr sdram.
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 57 ? rev 1.1 consumer dram jul. 2011 dada input (write) (timing burst length =4) dada output (read) (timing burst length =4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 58 ? rev 1.1 consumer dram jul. 2011 initialize and mode register set
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 59 ? rev 1.1 consumer dram jul. 2011 power down mode
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 60 ? rev 1.1 consumer dram jul. 2011 auto refresh
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 61 ? rev 1.1 consumer dram jul. 2011 self refresh mode
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 62 ? rev 1.1 consumer dram jul. 2011 read without auto precharge (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 63 ? rev 1.1 consumer dram jul. 2011 read with auto precharge (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 64 ? rev 1.1 consumer dram jul. 2011 bank read access (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 65 ? rev 1.1 consumer dram jul. 2011 write without auto prechareg (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 66 ? rev 1.1 consumer dram jul. 2011 write with auto precharge (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 67 ? rev 1.1 consumer dram jul. 2011 bank write access (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 68 ? rev 1.1 consumer dram jul. 2011 write dm operation (burst length = 4)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 69 ? rev 1.1 consumer dram jul. 2011 package dimensions (400mil; 66 pin tsop package)
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 70 ? rev 1.1 consumer dram jul. 2011 revision log rev date modification 0.1 jul 2010 preliminary edition 0.2 dec 2010 revised t ck (max.) of ddr400 and ddr450 0.3 jan 2011 added t ck parameters to cl=3/2.5/2 1.0 jun 2011 official release 1.1 jul 2011 added i dd2q parameters and removed -4t from ordering information
nt5ds64m8ds nt5ds32m16ds 512mb ddr sdram ? ? ? ??? 71 ? rev 1.1 consumer dram jul. 2011 nanya technology corporation. all rights reserved. printed in taiwan, r.o.c., 2011 the following are trademarks of nanya technology corporation: nanya and the nanya logo other company, product and service names may be trademarks or service marks of others. nanya technology corporation (ntc) reserves the right to make changes without notice. ntc warrants performance of its semiconductor products and related software to the specifications app licable at the time of sale in accordance with ntc?s stand ard warranty. testing and other quality control techniques are utilize to the extent ntc deems necessary to support this warranty. specific t esting of all parameters of each device is not necessarily performe d, except those mandated by government requirements. certain applications using semiconductor products may involve po tential risks of death, personal injury, or severe property or environmental damage (?critical applications?). ntc semiconductor products are not designed, intend, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. inclusion of ntc products in such applications is understood to be fully at the risk of the cust omer. use of ntc products in su ch applications requires the written approval of an appropriate ntc officer. ques tion concerning potential risk applications should be directed to ntc through a local sales office. in order to minimize risks asso ciated with the customer?s applications, adequate design and operating safeguards should be prov ided by customer to minimize the inherent or procedural hazards. ntc assumes no liability of applications assi stance, customer product design, software performance, or infringement of patents or services described herein. nor does ntc warrant or repr esent that any license, either express or implied, is granted under any patent ri ght, copyright, mask work right, or other intellectual property right of ntc cove ring or relating to any combination, machine, or process in wh ich such semiconductor products or services might be or are used. nanya technology corporation hwa ya technology park 669, fu hsing 3rd rd., kueishan, taoyuan, taiwan, r.o.c. the nanya technology corporation home page can be found at: http:\\www.nanya.com


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