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| Accutek Microcircuit Corporation DESCRIPTION The Accutek AK536512W high density memory module is a CMOS dynamic RAM organized in 512K x 36 bit words. The module consists of sixteen standard 256K x 4 DRAMs in plastic SOJ packages and eight 256K x 1 DRAMs in PLCC packages. The assembly has 12 drams mounted on each side of a printed circuit board in a 72 pad leadless SIM configuration. This configuration allows socket-mounting of large quantities of memory in applications where high density and ease of inserting additional memory are important. The operation of the AK536512 is identical to sixteen 256K x 4 plus eight 256K x 1 DRAMs. There are four CAS lines and four RAS lines. On each bank of 256K x 36, independent byte control is accomplished by four CAS lines. Each separate CAS line controls four 256K x 4 DRAMs and two 256K x 1 DRAMs with data in tied to data out to form a 9 bit byte. Two banks of 36 bits are controlled by the two pairs of RAS lines. An eighteen bit data path can be produced by connecting DQ0 to DQ18, DQ1 to DQ19, etc. and alternately strobing RAS0 with RAS1 and RAS2 with RAS3. * * * * * * AK536512W 524,288 Word by 36 Bit CMOS Dynamic Random Access Memory + + FEATURES 524,288 x 36 bit organization 72 pad Single In-Line Module Multiple CAS and RAS lines allow x18 or x36 bit widths CAS-before-RAS refresh Operating free air temperature 0oC to 70oC Single 5 Volt Power Supply * Power 5.41 Watt Max Active (70nS) 4.75 Watt Max Active (80 nS) 4.09 Watt Max Active (100 nS) 132 mW Max Standby * 512 Refresh Cycles, 8 mSEC * Available in Fast Page Mode and Static Column Mode versions * Downward compatible with AK536256W * Upward compatible with AK5361024W, AK5362048W, AK5364096W and AK5368192W PIN NOMENCLATURE DQ0 - DQ35 A0 - A8 CAS0 - CAS3 RAS0 - RAS3 WE PD Vcc Vss NC Data In/Data Out Address Inputs Column Address Strobe Row Address Strobe Write Enable Presence Detect 5v Supply Ground No Connect PIN ASSIGNMENT PIN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 SYMBOL Vss DQ0 DQ18 DQ1 DQ19 DQ2 DQ20 DQ3 DQ21 Vcc NC A0 A1 A2 A3 A4 A5 A6 PIN # 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 SYMBOL NC DQ4 DQ22 DQ5 DQ23 DQ6 DQ24 DQ7 DQ25 A7 NC Vcc A8 NC RAS3 RAS2 DQ26 DQ8 PIN # 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 SYMBOL DQ17 DQ35 Vss CAS0 CAS2 CAS3 CAS1 RAS0 RAS1 NC WE NC DQ9 DQ27 DQ10 DQ28 DQ11 DQ29 PIN # 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 SYMBOL DQ12 DQ30 DQ13 DQ31 Vcc DQ32 DQ14 DQ33 DQ15 DQ34 DQ16 NC PD1 PD2 PD3 PD4 NC Vss MODULE OPTIONS Leadless SIM: AK536512W Leaded ZIP: AK536512Z Presence Detect PD1 PD2 PD3 PD4 -60 NC Vss NC NC -70 NC Vss Vss NC -80 NC Vss NC Vss FUNCTIONAL DIAGRAM MECHANICAL DIMENSIONS 4.240" 4.260" 3.979" 3.989" 0.330" MAX 1.000" MAX 0.425" 0.375" + + 0.250" 0.080" 0.125" CC LL CC LL 0.050" TYP ACCUTEK MICROCIRCUIT CORPORATION BUSINESS CENTER at NEWBURYPORT 2 NEW PASTURE ROAD, SUITE 1 NEWBURYPORT, MA 01950-4054 PHONE: 978-465-6200 FAX: 978-462-3396 E-Mail: sales@accutekmicro.com Internet: www.accutekmicro.com Accutek reserves the right to make changes in specifications at any time and without notice. Accutek does not assume any responsibility for the use of any circuitry described; no circuit patent licenses are implied. Preliminary data sheets contain minimum and maximum limits based upon design objectives, which are subject to change upon full characterization over the specific operating conditions. |
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