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Accutek Microcircuit Corporation
DESCRIPTION
The Accutek AK532256AW high density memory module is a CMOS dynamic RAM organized in 265K x 32 bit words. The module consists of two standard 256K x 16 bits DRAMs in plastic SOJ packages. The assembly has 2 DRAMs mounted on the front 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 AK532256AW is identical to eight 256K x 4 Drams. There are four CAS lines and two RAS lines. On each bank of 256K x 32, independent byte control is accomplished by four CAS lines. Each seperate CAS line controls one byte of the 256K x 16 Dram.
1
AK532256AW 262,144 Word by 32 Bit CMOS Dynamic Random Access Memory
72
FEATURES
* 262,144 x 32 bit organization * 72 pad Single In-Line Module * CAS-before-RAS, RAS-only or hidden refresh * Operating free air temperature 0oC to 70oC * Single 5 Volt Power Supply * 1024 Refresh Cycles, 16 mSEC * Available in Fast Page Mode * Power: 2.090 Watt Max Active (50 nS) 1.870 Watt Max Active (60 nS) 1.760 Watt Max Active (70 nS) 22 mW Max Standby * Available in Fast Page Mode or EDO * Upward compatible with AK532512W, AK5321024W, AK5322048W, AK5324096W and AK5328192W
ADDITIONAL OPTIONS AVAILABLE
* 256K x 36 version, AK536256W * 512K x 32 version, AK532512W * 512K x 36 version, AK536512W
PIN NOMENCLATURE
DQ0 - DQ31 A0 - A8 CAS0 - CAS3 RAS0, RAS2 WE PD1 - PD4 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 DQ16 DQ1 DDQ17 DQ2 DQ18 DQ3 DQ19 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 DQ20 DQ5 DQ21 DQ6 DQ22 DQ7 DQ23 A7 NC Vcc A8 NC NC RAS2 NC NC PIN # 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 SYMBOL NC NC Vss CAS0 CAS2 CAS3 CAS1 RAS0 NC NC WE NC DQ8 DQ24 DQ9 DQ25 DQ10 DQ26 PIN # 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 SYMBOL DQ11 DQ27 DQ12 DQ28 Vcc DQ29 DQ13 DQ30 DQ14 DQ31 DQ15 NC PD1 PD2 PD3 PD4 NC Vss
MODULE OPTIONS
Leadless SIM: AK532256AW Leaded ZIP: AK532256AZ
Presence Detect PD1 PD2 PD3 PD4 -60 Vss NC NC NC -70 Vss NC Vss NC -80 Vss NC NC Vss
FUNCTIONAL DIAGRAM
DQ16 DQ17 + DQ18 + DQ19 + DQ20 + DQ21 + DQ22 + DQ23
+ +
DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7
DQ8 DQ7 DQ10 DQ11 DQ12 DQ13 DQ14 DQ15
DQ0 DQ1 DQ2 DQ3 DQ4 DQ5 DQ6 DQ7 A0 - A8 LCAS RAS
A0 - A8
UCAS
UCAS
LCAS
RAS
WE
RAS0 +
CAS0 +
CAS1 +
RAS2 +
CAS2 +
A0 - A8 +
MECHANICAL DIMENSIONS
4.250" 3.985"
CAS3 +
WE
+
+
72
+
0.700" MAX
0.425" 0.375"
0.250"
1
72
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.
WE
0.200" MAX
OE
OE
DQ8 DQ7 DQ10 DQ11 DQ12 DQ13 DQ14 DQ15
DQ24 DQ25 + DQ26 + DQ27 + DQ28 + DQ29 + DQ30 + DQ31
+
DQ8 DQ7 + DQ10 + DQ11 + DQ12 + DQ13 + DQ14 + DQ15
+
DQ0 DQ1 + DQ2 + DQ3 + DQ4 + DQ5 + DQ6 + DQ7
+ +
+
+

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