View AT49BV2048_6800588.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 features ? low voltage operation C2.7v read C 5v program/erase ? fast read access time - 120 ns ? internal erase/program control ? sector architecture C one 8k words (16k bytes) boot block with programming lockout C two 8k words (16k bytes) parameter blocks C one 104k words (208k bytes) main memory array block ? fast sector erase time - 10 seconds ? word-by-word programming - 10 s/word ? hardware data protection ? data polling for end of program detection ? low power dissipation C 25 ma active current C 50 a cmos standby current ? typical 10,000 write cycles description the AT49BV2048 and at49lv2048 are 3-volt, 2-megabit flash memories organized as 128k words of 16 bits each. manufactured with atmels advanced nonvolatile cmos technology, the devices offer access times to 120 ns with power dissipation of just 67 mw at 2.7v read. when deselected, the cmos standby current is less than 50 a. 2-megabit (128k x 16) 3-volt only flash memory AT49BV2048 at49lv2048 preliminary rev. 0853cC12/98 pin configurations pin name function a0 - a16 addresses ce chip enable oe output enable we write enable reset reset vpp program/erase power supply i/o0 - i/o15 data inputs/outputs nc no connect tsop top view type1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 a15 a14 a13 a12 a11 a10 a9 a8 nc nc we reset vpp nc nc nc nc a7 a6 a5 a4 a3 a2 a1 a16 nc gnd i/o15 i/o7 i/o14 i/o6 i/o13 i/o5 i/o12 i/o4 vcc i/o11 i/o3 i/o10 i/o2 i/o9 i/o1 i/o8 i/o0 oe gnd ce a0 soic (sop) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 vpp nc nc a7 a6 a5 a4 a3 a2 a1 a0 ce gnd oe i/o0 i/o8 i/o1 i/o9 i/o2 i/o10 i/o3 i/o11 reset we a8 a9 a10 a11 a12 a13 a14 a15 a16 nc gnd i/o15 i/o7 i/o14 i/o6 i/o13 i/o5 i/o12 i/o4 vcc (continued)
at49bv/lv2048 2 to allow for simple in-system reprogrammability, the AT49BV2048/lv2048 does not require high input voltages for programming. reading data out of the device is similar to reading from an eprom; it has standard ce , oe , and we inputs to avoid bus contention. reprogramming the AT49BV2048/lv2048 is performed by first erasing a block of data and then programming on a word-by-word basis. the device is erased by executing the erase command sequence; the device internally controls the erase opera- tion. the memory is divided into three blocks for erase operations. there are two 8k word parameter block sec- tions and one sector consisting of the boot block and the main memory array block. the AT49BV2048/lv2048 is programmed on a word-by-word basis. the device has the capability to protect the data in the boot block; this feature is enabled by a command sequence. once the boot block programming lockout feature is enabled, the data in the boot block cannot be changed when input levels of 3.6 volts or less are used. the typical number of program and erase cycles is in excess of 10,000 cycles. the optional 8k word boot block section includes a repro- gramming lock out feature to provide data integrity. the boot sector is designed to contain user secure code, and when the feature is enabled, the boot sector is protected from being reprogrammed. during a chip erase, sector erase, or word programming, the v pp pin must be at 5v 10%. block diagram device operation read: the AT49BV2048/lv2048 is accessed like an eprom. when ce and oe are low and we is high, the data stored at the memory location determined by the address pins is asserted on the outputs. the outputs are put in the high impedance state whenever ce or oe is high. this dual-line control gives designers flexibility in pre- venting bus contention. command sequences: when the device is first pow- ered on it will be reset to the read or standby mode depending upon the state of the control line inputs. in order to perform other device functions, a series of command sequences are entered into the device. the command sequences are shown in the command definitions table (i/o8 - i/o15 are don't care inputs for the command codes). the command sequences are written by applying a low pulse on the we or ce input with ce or we low (respec- tively) and oe high. the address is latched on the falling edge of ce or we , whichever occurs last. the data is latched by the first rising edge of ce or we . standard microprocessor write timings are used. the address loca- tions used in the command sequences are not affected by entering the command sequences. reset: a reset input pin is provided to ease some sys- tem applications. when reset is at a logic high level, the device is in its standard operating mode. a low level on the reset input halts the present device operation and puts the outputs of the device in a high impedance state. when a high level is reasserted on the reset pin, the device returns to the read or standby mode, depending upon the state of the control inputs. by applying a 12v 0.5v input signal to the reset pin the boot block array can be repro- grammed even if the boot block program lockout feature has been enabled (see boot block programming lockout override section).
at49bv/lv2048 3 erasure: before a word can be reprogrammed, it must be erased. the erased state of memory bits is a logical 1. the entire device can be erased by using the chip erase command or individual sectors can be erased by using the sector erase commands. chip erase: the entire device can be erased at one time by using the 6-byte chip erase software code. after the chip erase has been initiated, the device will internally time the erase operation so that no external clocks are required. the maximum time to erase the chip is t ec . if the boot block lockout has been enabled, the chip erase will not erase the data in the boot block; it will erase the main memory block and the parameter blocks only. after the chip erase, the device will return to the read or standby mode. sector erase: as an alternative to a full chip erase, the device is organized into three sectors that can be individu- ally erased. there are two 8k word parameter block sec- tions and one sector consisting of the boot block and the main memory array block. the sector erase command is a six bus cycle operation. the sector address is latched on the falling we edge of the sixth cycle while the 30h data input command is latched at the rising edge of we . the sector erase starts after the rising edge of we of the sixth cycle. the erase operation is internally controlled; it will automatically time to completion. when the boot block pro- gramming lockout feature is not enabled, the boot block and the main memory block will erase together (from the same sector erase command). once the boot region has been protected, only the main memory array sector will erase when its sector erase command is issued. whenever a parameter block is erased and reprogrammed, the other parameter block should be erased and reprogrammed before the first parameter block is erased again. word programming: once a memory block is erased, it is programmed (to a logical 0) on a word-by-word basis. programming is accomplished via the internal device com- mand register and is a 4 bus cycle operation. the device will automatically generate the required internal program pulses. any commands written to the chip during the embedded programming cycle will be ignored. if a hardware reset hap- pens during programming, the data at the location being programmed will be corrupted. please note that a data 0 cannot be programmed back to a 1; only erase operations can convert 0s to 1s. programming is completed after the specified t bp cycle time. the data polling feature may also be used to indicate the end of a program cycle. boot block programming lockout: the device has one designated block that has a programming lockout feature. this feature prevents programming of data in the designated block once the feature has been enabled. the size of the block is 8k words. this block, referred to as the boot block, can contain secure code that is used to bring up the system. enabling the lockout feature will allow the boot code to stay in the device while data in the rest of the device is updated. this feature does not have to be acti- vated; the boot block's usage as a write protected region is optional to the user. the address range of the boot block is 00000h to 01fffh. once the feature is enabled, the data in the boot block can no longer be erased or programmed when input levels of 5.5v or less are used. data in the main memory block can still be changed through the regular programming method. to activate the lockout feature, a series of six program commands to specific addresses with specific data must be performed. please refer to the command definitions table. boot block lockout detection: a software method is available to determine if programming of the boot block section is locked out. when the device is in the soft- ware product identification mode (see software product identification entry and exit sections) a read from address location 00002h will show if programming the boot block is locked out. if the data on i/o0 is low, the boot block can be programmed; if the data on i/o0 is high, the program lock- out feature has been enabled and the block cannot be pro- grammed. the software product identification exit code should be used to return to standard operation. boot block programming lockout override: the user can override the boot block programming lockout by taking the reset pin to 12 0.5 volts. by doing this protected boot block data can be altered through a chip erase, sector erase or word programming. when the reset pin is brought back to ttl levels the boot block programming lockout feature is again active. product identification: the product identification mode identifies the device and manufacturer as atmel. it may be accessed by hardware or software operation. the hardware operation mode can be used by an external pro- grammer to identify the correct programming algorithm for the atmel product. for details, see operating modes (for hardware operation) or software product identification. the manufacturer and device code is the same for both modes. data polling: the AT49BV2048/lv2048 features data polling to indicate the end of a program cycle. during a pro- gram cycle an attempted read of the last byte loaded will result in the complement of the loaded data on i/o7. once the program cycle has been completed, true data is valid on all outputs and the next cycle may begin. during a chip or sector erase operation, an attempt to read the device will give a 0 on i/o7. once the program or erase cycle has completed, true data will be read from the device. data polling may begin at any time during the program cycle. toggle bit: in addition to data polling the AT49BV2048/lv2048 provides another method for deter-
at49bv/lv2048 4 mining the end of a program or erase cycle. during a pro- gram or erase operation, successive attempts to read data from the device will result in i/o6 toggling between one and zero. once the program cycle has completed, i/o6 will stop toggling and valid data will be read. examining the toggle bit may begin at any time during a program cycle. hardware data protection: hardware features protect against inadvertent programs to the AT49BV2048/lv2048 in the following ways: (a) v cc sense: if v cc is below 1.8v (typical), the program function is inhib- ited. (b) v cc power on delay: once v cc has reached the v cc sense level, the device will automatically time out 10 ms (typical) before programming. (c) program inhibit: hold- ing any one of oe low, ce high or we high inhibits pro- gram cycles. (d) noise filter: pulses of less than 15 ns (typical) on the we or ce inputs will not initiate a program cycle. input levels: while operating with a 2.7v to 3.6v power supply, the address inputs and control inputs (oe , ce , and we ) may be driven from 0 to 5.5v without adversely affecting the operation of the device. the i/o lines can only be driven from 0 to v cc + 0.6v. notes: 1. the data format in each bus cycle is as follows: i/o15 - i/o8 (dont care); i/o7 - i/o0 (hex) 2. the 8k word boot sector has the address range 00000h to 01fffh. 3. either one of the product id exit commands can be used. 4. sa = sector addresses: sa = 03xxx for parameter block 1 sa = 05xxx for parameter block 2 sa = 1fxxx for main memory array 5. when the boot block programming lockout feature is not enabled, the boot block and the main memory block will erase. command definition (in hex) (1) command sequence bus cycles 1st bus cycle 2nd bus cycle 3rd bus cycle 4th bus cycle 5th bus cycle 6th bus cycle addr data addr data addr data addr data addr data addr data read 1 addr d out chip erase 6 5555 aa 2aaa 55 5555 80 5555 aa 2aaa 55 5555 10 sector erase 6 5555 aa 2aaa 55 5555 80 5555 aa 2aaa 55 sa (4)(5) 30 word program 4 5555 aa 2aaa 55 5555 a0 addr d in boot block lockout (2) 6 5555 aa 2aaa 55 5555 80 5555 aa 2aaa 55 5555 40 product id entry 3 5555 aa 2aaa 55 5555 90 product id exit (3) 3 5555 aa 2aaa 55 5555 f0 product id exit (3) 1xxxxf0 absolute maximum ratings* operating temperature ................................. -55c to +125c *notice: stresses beyond those listed under absolute maximum ratings may cause permanent dam- age to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. storage temperature ..................................... -65c to +150c voltage on any pin with respect to ground .....................................-1.0v to +7.0v maximum operating voltage............................................. 6.6v dc output current...................................................... 25.0 ma
at49bv/lv2048 5 notes: 1. x can be v il or v ih . 2. refer to ac programming waveforms. 3. vh = 12.0v 0.5v. 4. manufacturing code: 1fh, device code: 82h 5. see details under software product identification entry/exit. note: 1. in the erase mode, i cc is 50 ma. dc and ac operating range at49lv2048-12 at49bv/lv2048-15 at49bv/lv2048-20 operating temperature (case) com. 0 c - 70 c0 c - 70 c0 c - 70 c ind. -40 c - 85 c-40 c - 85 c-40 c - 85 c v cc power supply at49lv2048 3.0v to 3.6v 3.0v to 3.6v 3.0v to 3.6v AT49BV2048 n/a 2.7v to 3.6v 2.7v to 3.6v operating modes mode ce oe we reset v pp ai i/o read v il v il v ih v ih xaid out program/erase (2) v il v ih v il v ih 5v 10% ai d in standby/program inhibit v ih x (1) xv ih x x high z program inhibit x x v ih v ih v il program inhibit x v il xv ih v il output disable x v ih xv ih x high z reset x x x v il x x high z product identification hardware v il v il v ih v ih a1 - a16 = v il , a9 = v h , (3) a0 = v il manufacturer code (4) a1 - a16 = v il , a9 = v h , (3) a0 = v ih device code (4) software (5) v ih a0 = v il , a1 - a16 = v il manufacturer code (4) a0 = v ih , a1 - a16 = v il device code (4) dc characteristics symbol parameter condition min max units i li input load current v in = 0v to v cc 10 a i lo output leakage current v i/o = 0v to v cc 10 a i sb1 v cc standby current cmos ce = v cc - 0.3v to v cc 50 a i sb2 v cc standby current ttl ce = 2.0v to v cc 1ma i cc (1) v cc active current f = 5 mhz; i out = 0 ma 25 ma v il input low voltage 0.8 v v ih input high voltage 2.0 v v ol output low voltage i ol = 2.1 ma 0.45 v v oh output high voltage i oh = -400 a 2.4 v
at49bv/lv2048 6 ac read waveforms (1)(2)(3)(4) notes: 1. ce may be delayed up to t acc - t ce after the address transition without impact on t acc . 2. oe may be delayed up to t ce - t oe after the falling edge of ce without impact on t ce or by t acc - t oe after an address change without impact on t acc . 3. t df is specified from oe or ce whichever occurs first (cl = 5 pf). 4. this parameter is characterized and is not 100% tested. input test waveforms and measurement level output test load note: 1. this parameter is characterized and is not 100% tested. ac read characteristics symbol parameter at49lv2048-12 at49bv/lv2048-15 at49bv/lv2048-20 units min max min max min max t acc address to output delay 120 150 200 ns t ce (1) ce to output delay 120 150 200 ns t oe (2) oe to output delay 0 50 0 100 0 100 ns t df (3)(4) ce or oe to output float 0 30 0 50 0 50 ns t oh output hold from oe , ce or address, whichever occurred first 00 0ns pin capacitance (1) (f = 1 mhz, t = 25 c) symbol typ max units conditions c in 46pfv in = 0v c out 812pfv out = 0v
at49bv/lv2048 7 ac word load waveforms we controlled ce controlled ac word load characteristics symbol parameter min max units t as , t oes address, oe set-up time 10 ns t ah address hold time 100 ns t cs chip select set-up time 0 ns t ch chip select hold time 0 ns t wp write pulse width (we or ce ) 200 ns t ds data set-up time 100 ns t dh , t oeh data, oe hold time 10 ns t wph write pulse width high 200 ns
at49bv/lv2048 8 program cycle waveforms sector or chip erase cycle waveforms notes: 1. oe must be high only when we and ce are both low. 2. for chip erase, the address should be 5555h. for sector erase, the address depends on what sector is to be erased. (see note 4 under command definitions.) 3. for chip erase, the data should be 10h, and for sector erase, the data should be 30h. program cycle characteristics symbol parameter min typ max units t bp word programming time 30 50 m s t as address set-up time 0 ns t ah address hold time 100 ns t ds data set-up time 100 ns t dh data hold time 0 ns t wp write pulse width 200 ns t wph write pulse width high 200 ns t ec erase cycle time 10 seconds
at49bv/lv2048 9 notes: 1. these parameters are characterized and not 100% tested. 2. see t oe spec in ac read characteristics. data polling waveforms notes: 1. these parameters are characterized and not 100% tested. 2. see t oe spec in ac read characteristics. toggle bit waveforms (1)(2)(3) notes: 1. toggling either oe or ce or both oe and ce will operate toggle bit. the t oehp specification must be met by the toggling input(s). 2. beginning and ending state of i/o6 will vary. 3. any address location may be used but the address should not vary. data polling characteristics (1) symbol parameter min typ max units t dh data hold time 10 ns t oeh oe hold time 10 ns t oe oe to output delay (2) ns t wr write recovery time 0 ns toggle bit characteristics (1) symbol parameter min typ max units t dh data hold time 10 ns t oeh oe hold time 10 ns t oe oe to output delay (2) ns t oehp oe high pulse 150 ns t wr write recovery time 0 ns
at49bv/lv2048 10 software product identification entry (1) software product identification exit (1)(6) notes for software product identification: 1. data format: i/o15 - i/o8 (dont care); i/o7 - i/o0 (hex) address format: a14 - a0 (hex). 2. a1 - a16 = v il . manufacture code is read for a0 = v il ; device code is read for a0 = v ih 3. the device does not remain in identification mode if powered down. 4. the device returns to standard operation mode. 5. manufacturer code: 1fh device code: 82h 6. either one of the product id exit commands can be used. boot block lockout enable algorithm (1) notes for boot block lockout feature enable: 1. data format: i/o15 - i/o8 (dont care); i/o7 - i/o0 (hex) address format: a14 - a0 (hex). 2. boot block lockout feature enabled. load data aa to address 5555 load data 55 to address 2aaa load data 90 to address 5555 enter product identification mode (2)(3)(5) load data aa to address 5555 load data 55 to address 2aaa load data f0 to address 5555 exit product identification mode (4) or load data f0 to any address exit product identification mode (4) load data aa to address 5555 load data 55 to address 2aaa load data 80 to address 5555 load data aa to address 5555 load data 55 to address 2aaa load data 40 to address 5555 pause 1 second (2)
at49bv/lv2048 11 note: 1. the AT49BV2048/lv2048 has an optional boot block feature. the part number shown in the ordering information table is for devices with the boot block in the lower address range (i.e., 00000h to 01fffh). users requiring the boot block to be in the higher address range should contact atmel. ordering information (1) t acc (ns) i cc (ma) ordering code package operation range active standby 120 25 0.05 at49lv2048-12rc at49lv2048-12tc 44r 48t commercial (0 to 70 c) at49lv2048-12ri at49lv2048-12ti 44r 48t industrial (-40 to 85 c) 150 25 0.05 at49lv2048-15rc at49lv2048-15tc 44r 48t commercial (0 to 70 c) at49lv2048-15ri at49lv2048-15ti 44r 48t industrial (-40 to 85 c) 200 25 0.05 at49lv2048-20rc at49lv2048-20tc 44r 48t commercial (0 to 70 c) at49lv2048-20ri at49lv2048-20ti 44r 48t industrial (-40 to 85 c) 150 25 0.05 AT49BV2048-15rc AT49BV2048-15tc 44r 48t commercial (0 to 70 c) AT49BV2048-15ri AT49BV2048-15ti 44r 48t industrial (-40 to 85 c) 200 25 0.05 AT49BV2048-20rc AT49BV2048-20tc 44r 48t commercial (0 to 70 c) AT49BV2048-20ri AT49BV2048-20ti 44r 48t industrial (-40 to 85 c) package type 44r 44-lead, 0.525" wide, plastic gull wing small outline package (soic/sop) 48t 48-lead, thin small outline package (tsop)
at49bv/lv2048 12 packaging information *controlling dimension: millimeters 44r, 44-lead, 0.525" wide plastic gull wing small outline (soic) dimensions in inches and (millimeters) 48t, 48-lead, plastic thin small outline package (tsop) dimensions in millimeters and (inches)* jedec outline mo-142 dd
? atmel corporation 1998. atmel corporation makes no warranty for the use of its products, other than those expressly contained in the companys standard war- ranty which is detailed in atmels terms and conditions located on the companys website. the company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any tim e without notice, and does not make any commitment to update the information contained herein. no licenses to patents or other intellectu al prop- erty of atmel are granted by the company in connection with the sale of atmel products, expressly or by implication. atmels pr oducts are not authorized for use as critical components in life support devices or systems. marks bearing ? and/or ? are registered trademarks and trademarks of atmel corporation. terms and product names in this document may be trademarks of others. atmel headquarters atmel operations corporate headquarters 2325 orchard parkway san jose, ca 95131 tel (408) 441-0311 fax (408) 487-2600 europe atmel u.k., ltd. coliseum business centre riverside way camberley, surrey gu15 3yl england tel (44) 1276-686677 fax (44) 1276-686697 asia atmel asia, ltd. room 1219 chinachem golden plaza 77 mody road tsimshatsui east kowloon, hong kong tel (852) 27219778 fax (852) 27221369 japan atmel japan k.k. tonetsu shinkawa bldg., 9f 1-24-8 shinkawa chuo-ku, tokyo 104-0033 japan tel (81) 3-3523-3551 fax (81) 3-3523-7581 atmel colorado springs 1150 e. cheyenne mtn. blvd. colorado springs, co 80906 tel (719) 576-3300 fax (719) 540-1759 atmel rousset zone industrielle 13106 rousset cedex, france tel (33) 4 42 53 60 00 fax (33) 4 42 53 60 01 fax-on-demand north america: 1-(800) 292-8635 international: 1-(408) 441-0732 e-mail literature@atmel.com web site http://www.atmel.com bbs 1-(408) 436-4309 printed on recycled paper. 0853cC12/98/xm

▲Up To Search▲

Price & Availability of AT49BV2048

	To Download AT49BV2048 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .