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Motorola Semiconductors - 256K x 32 Bit Fast Static RAM Module

Numéro de référence MCM32257
Description 256K x 32 Bit Fast Static RAM Module
Fabricant Motorola Semiconductors 
Logo Motorola Semiconductors 





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MCM32257 fiche technique
MOTOROLA
• SEMICONDUCTOR
TECHNICAL DATA
256K X 32 Bit
Fast Static RAM Module
The MCM32257 is an 8M bit static random access memory module organized as
. 262,144 words of 32 bits. The module is a 64-lead zig-zag in-line package (ZIP) or
64-lead single in-line memory module (SIMM) consisting of eight MCM6229A fast
static RAMs packaged in 28-lead SOJ packages and mounted on a printed circuit
board along with eight decoupling capacitors.
The MCM6229A is a high-performance CMOS fast static RAM organized as
262,144 words of 4 bits, fabricated using high-performance silicon-gate CMOS tech-
nology. Static design eliminates the need for external clocks or timing strobes, while
CMOS circuitry reduces power consumption and provides for greater reliability.
The MCM32257 is equipped with output enable (G) and four separate byte enable
(Ef - E4) inputs, allowing for greater system flexibility. The G input, when high, will
force the outputs to high impedance. Ex high will do the same for byte x.
PDO and PD1 are reserved for density identification. PDO and PD1 are connected
to ground. These pins can be used to identify the density of the memory module.
• Single 5 V ± 10% Power Supply
• Fast Access Time: 20/25/35 ns
• Three-State Outputs
• Fully TTL Compatible
• JEDEC Standard Pin Out
• Power Operation: 1360/1200/1120 mA Maximum, Active AC
• High Board Density ZIP Package
• Byte Operation: Four Separate Chip Enables, One for Each Byte (Eight Bits)
• High Quality Four-Layer FR4 PWB with Separate Internal Power and Ground
Planes
• Incorporates Motorola's State-of-the-Art Fast Static RAMs
PIN NAMES
AO-A17 ........................... Address Inputs
W ................................... Write Enable
G .................................. Output Enable
El - E4 .............................. Byte Enables
000 - 0031 ...................... Data InpuVOutput
Vee ........................... + 5 V Power Supply
Vss ...................................... Ground
PD~ - POl ........................ Package Density
For proper operation ofthe device, VSS must be connected
to ground.
MCM32257
PIN ASSIGNMENT
TOP VIEW
64 LEAD ZIP - CASE 871
64 LEAD SIMM - CASE TBD
POO VSS
000 POl
001 OOS
002 D09
003 DOlO
Vee 0011
Al AO
A3 A2
AS A4
004 D012
005 0013
006 0014
007 0015
Vi VSS
A6
A7
Ef E2
E3
A9
VSS
0016
0017
0018
0019
All
A13
A15
A16
0020
0021
0022
0023
VSS
E4
A8
G
0024
0025
0026
0027
Al0
A12
A14
Vee
A17
0028
0029
0030
0031
MCM32257
5-22
MOTOROLA FAST SRAM DATA

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