PRELIMINARY
PDM4M4110
512K x 32 CMOS
Static RAM Module
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The PDM4M4110 is packaged in a 72-pin FR-4 ZIP
(Zig-zag In-line vertical Package) or a 72-pin SIMM
(Single In-line Memory Module). The ZIP configura-
Features
■ High-density 2 megabyte Static RAM module
■ Low profile 72-pin ZIP (Zig-zag In-line vertical
Package) or 72-pin SIMM (Single In-line Memory
Module)
tion allows 72 pins to be placed on a package 3.95" 2
long and 0.250" wide. At only 0.600" high, this low-
profile package is ideal for systems with minimum
board spacing. The SIMM configuration allows use of
■ Fast access time: 15 ns (max.)
■ Surface mounted plastic components on an epoxy
laminate (FR-4) substrate Single 5V (±10%) power
supply
■ Multiple V pins and decoupling capacitors for
maximum noise immunity
■ Inputs/outputs directly TTL compatible
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edge mounted sockets to secure the module.
All inputs and outputs of the PDM4M4110 are TTL
compatible and operate from a single 5V supply. Mul-
tiple ground pins and on board decoupling capacitors
SS
4
provide maximum immunity from noise.
Four identification pins (PD0, PD1, PD2, PD3) are pro-
vided for applications in which different density
versions of the module are used. In this way, the tar-
get system can read the respective levels of PD0, PD1,
PD2, PD3 to determine a 512K depth.
Description
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The PDM4M4110 is a 512K x 32 static RAM module
constructed on an epoxy laminate (FR-4) substrate
using four (4) 512K x 8 static RAMs in plastic SOJ
packages. Availability of four chip select lines pro-
vides byte access. The PDM4M4110 is available with
access times as fast as 15 ns with minimal power
consumption.
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7
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Functional Block Diagram
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CS1
CS2
CS3
CS4
19
A18-A0
WE
4
10
PD3-PD0
512K x 32
RAM
OE
11
8
8
8
8
I/O31-I/O0
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Rev 2.3 - 1/15/96
8-65