Accutek Microcircuit Corporation AK536256W 262,144 Word by 36 Bit CMOS Dynamic Random Access Memory DESCRIPTION The Accutek AK536256W high density memory module is a CMOS dynamic RAM organized in 256K x 36 bit words. The module consists of eight standard 256K x 4 DRAMs in plastic SOJ packages and four 256K x 1 DRAMs in PLCC packages. The assembly has 12 drams mounted on the front side of a printed circuit board in a 72 pad leadless SIM configuration. + + The operation of the AK536256W is identical to eight 256K x 4 plus four 256K x 1 DRAMs. There are four CAS lines and two RAS lines. Independent byte control is accomplished by four CAS lines. Each separate CAS line controls two 256K x 4 DRAMs, along with one 256K x 1 DRAM with data in tied to data out to form a 9 bit byte. The bank of 36 bits is controlled by the two RAS lines. An eighteen bit data path can be produced by connecting DQ0 to DQ18, DQ1 to DQ19, etc. and alternately strobing RAS0 and RAS2. FEATURES · · · · · · 262,144 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 2.705 Watt Max Active (70nS) 2.375 Watt Max Active (80 nS) 2.045 Watt Max Active (100 nS) 66 mW Max Standby · 512 Refresh Cycles, 8 mSEC · Available in Fast Page Mode and Static Column Mode versions · Upward compatible with AK536512W, AK5361024W, AK5362048W, AK5364096W and AK5368192W PIN NOMENCLATURE PIN ASSIGNMENT DQ0 - DQ35 Data In/Data Out A0 - A8 Address Inputs PIN # 1 CAS0 - CAS3 Column Address Strobe RAS0, RAS2 WE SYMBOL Vss PIN # 19 SYMBOL NC PIN # 37 SYMBOL DQ17 PIN # 55 SYMBOL DQ12 2 DQ0 3 DQ18 20 DQ4 38 DQ35 56 DQ30 21 DQ22 39 Vss 57 Row Address Strobe 4 DQ13 DQ1 22 DQ5 40 CAS0 58 Write Enable DQ31 5 DQ19 23 DQ23 41 CAS2 59 Vcc 6 DQ2 24 DQ6 42 CAS3 60 DQ32 PD Presence Detect Vcc 5v Supply 7 DQ20 25 DQ24 43 CAS1 61 DQ14 8 DQ3 26 DQ7 44 RAS0 62 Vss DQ33 Ground 9 DQ21 27 DQ25 45 NC 63 DQ15 NC No Connect 10 Vcc 28 A7 46 NC 64 DQ34 11 NC 29 NC 47 WE 65 DQ16 12 A0 30 Vcc 48 NC 66 NC 13 A1 31 A8 49 DQ9 67 PD1 14 A2 32 NC 50 DQ27 68 PD2 15 A3 33 NC 51 DQ10 69 PD3 16 A4 34 RAS2 52 DQ28 70 PD4 17 A5 35 DQ26 53 DQ11 71 NC 18 A6 36 DQ8 54 DQ29 72 Vss MODULE OPTIONS Leadless SIM: AK536256W Leaded ZIP: AK536256Z Presence Detect PD1 -60 Vss -70 Vss -80 Vss PD2 PD3 NC NC NC NC Vss PD4 NC NC NC Vss FUNCTIONAL DIAGRAM CAS0 RAS0 CAS1 A0 A1 A2 A3 A4 A5 A6 A7 A8 A0 - A8 RAS CAS WE DQ1 DQ2 DQ3 DQ4 OE A0 - A8 RAS CAS WE DQ1 DQ2 DQ3 DQ4 OE DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 A0 - A8 RAS D CAS Q WE CAS2 RAS2 A0 - A8 RAS CAS WE DQ1 DQ2 DQ3 DQ4 OE A0 - A8 RAS CAS WE DQ1 DQ2 DQ3 DQ4 OE DQ9 DQ10 DQ11 DQ12 DQ13 DQ14 DQ15 DQ16 A0 - A8 RAS D CAS Q WE CAS3 A0 - A8 RAS CAS WE DQ1 DQ2 DQ3 DQ4 OE A0 - A8 RAS CAS WE DQ1 DQ2 DQ3 DQ4 OE DQ18 DQ19 DQ20 DQ21 DQ22 DQ23 DQ24 DQ25 A0 - A8 RAS D CAS Q WE A0 - A8 RAS CAS WE DQ1 DQ2 DQ3 DQ4 OE A0 - A8 RAS CAS WE DQ1 DQ2 DQ3 DQ4 OE DQ27 DQ28 DQ29 DQ30 DQ31 DQ32 DQ33 DQ34 A0 - A8 RAS D CAS Q WE WE DQ8 DQ17 DQ26 DQ35 MECHANICAL DIMENSIONS 4.240" 4.260" 0.200" MAX 3.979" 3.989" 1.000" MAX 0.425" 0.375" + + 0.250" 0.080" 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: [email protected] Internet: www.accutekmicro.com 0.050" TYP 0.125" CL CL CL CL 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.