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Accutek Microcircuit Corporation
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. * * * * * *
AK536256W 262,144 Word by 36 Bit CMOS Dynamic Random Access Memory
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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
DQ0 - DQ35 A0 - A8 CAS0 - CAS3 RAS0, RAS2 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 NC 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 NC 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: AK536256W Leaded ZIP: AK536256Z
Presence Detect PD1 PD2 PD3 PD4 -60 Vss NC NC NC -70 Vss NC Vss NC -80 Vss NC NC Vss
FUNCTIONAL DIAGRAM
CAS0 RAS0
CAS1
CAS2 RAS2
CAS3
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
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
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
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
A0 - A8 RAS D CAS Q WE
WE
DQ0 DQ1 DQ2 DQ3
DQ4 DQ5 DQ6 DQ7
DQ8
DQ9 DQ10 DQ11 DQ12
DQ13 DQ14 DQ15 DQ16
DQ17
DQ18 DQ19 DQ20 DQ21
DQ22 DQ23 DQ24 DQ25
DQ26
DQ27 DQ28 DQ29 DQ30
DQ31 DQ32 DQ33 DQ34
DQ35
MECHANICAL DIMENSIONS
4.240" 4.260" 3.979" 3.989"
0.200" MAX
1.000" MAX 0.425" 0.375"
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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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