EDI8F32259V
White Electronic Designs
256Kx32 Static RAM CMOS, High Speed Module
FEATURES
DESCRIPTION
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256Kx32 bit CMOS Static RAM
The EDI8F32259V is a high speed 8Mb Static RAM module
organizedas256Kwordsby32bits.Thismoduleisconstructed
from eight 256Kx4 Static RAMs in SOJ packages on an epoxy
laminate (FR4) board.
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Access Times: 12, 15, 20, and 25ns
Individual Byte Selects
Fully Static, No Clocks
tTL Compatible I/O
Four chip enables (E0#-E3#) are used to independently
enable the four bytes. Reading or writing can be executed on
individual bytes or any combination of multiple bytes through
proper use of selects.
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High Density Package with JEDEC Standard Pinouts
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72 Pin SIMM No. 175 (Angle)
72 Pin ZIP No. 176
The EDI8F32259V is offered in 72 pin ZIP/SIMM package
which enables eight megabits of memory to be placed in less
than 1.3 square inches of board space.
72 Pin SIMM No. 354 (Straight)
Single +3.3V (±10%) Supply Operation
All inputs and outputs are tTL compatible and operate from a
single 3.3V supply. Fully asynchronous circuitry requires no
clocks or refreshing for operation and provides equal access
and cycle times for ease of use.
The ZIP and SIMM modules contain four PD (Presence Detect)
pins which are used to identify module memory density in
applications where alternate modules can be interchanged.
PIN CONFIGURATIONS AND BLOCK DIAGRAM
FIG. 1
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PIN NAMES
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A0-A17
E0#-E3#
W#
Address Inputs
Chip Enables
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Write Enables
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G#
Output Enable
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DQ0-DQ31
VCC
Common Data Input/Output
Power (+5V ±10%)
Ground
VSS
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White Electronic Designs Corp. reserves the right to change products or specifications without notice.
Oct 2002
Rev. 0A
1
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com