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White Electronic Designs Corporation • (602) 437-1520 • www.whiteedc.com
WS256K32-XXX
HI-RELIABILITY PRODUCT
256Kx32 SRAM MODULE
PRELIMINARY*
FEATURES
■ Access Times 20, 25, 35ns
■ MIL-STD-883 Compliant Devices Available
■ Packaging
•66 pin, PGA Type, 1.185 inch square, Hermetic
Ceramic HIP (Package 401)
•68 lead, 40mm, Hermetic CQFP (Package 501)
■ Organized as 256Kx32, User Configurable as 512Kx16
■ Upgradable to 512Kx32 for future expansion
■ Data I/O Compatible with 3.3V devices
■ 2V Data Retention devices available
(WS256K32L-XXX low power version only)
■ Commercial, Industrial and Military Temperature Range
■ 5 Volt Power Supply
■ Low Power CMOS
■ TTL Compatible Inputs and Outputs
■ Weight
WS256K32N-XHX - 13 grams typical
WS256K32-XG4X - 20 grams typical
* This data sheet describes a product under development, not fully
characterized, and is subject to change without notice.
FIG. 1 PIN CONFIGURATION FOR WS256K32N-XHX
I/O8
I/O9
I/O10
A13
A14
A15
A16
A17
I/O0
I/O1
I/O2
NC
NC
GND
I/O
11
A10
A11
A12
VCC
CS1
NC
I/O
3
I/O15
I/O14
I/O13
I/O12
OE
NC
WE
1
I/O7
I/O6
I/O5
I/O4
I/O24
I/O25
I/O26
A6
A7
NC
A
8
A9
I/O16
I/O17
I/O18
VCC
NC
NC
I/O
27
A3
A4
A5
WE2
CS2
GND
I/O
19
I/O31
I/O30
I/O29
I/O28
A0
A1
A2
I/O23
I/O22
I/O21
I/O20
11 22 33 44 55 66
1 12 23 34 45 56
BLOCK DIAGRAM
TOP VIEW
PIN DESCRIPTION
I/O0-31 Data Inputs/Outputs
A0-17 Address Inputs
WE1-2 Write Enables
CS1-2 Chip Selects
OE Output Enable
VCC Power Supply
GND Ground
NC Not Connected
256K x 16
16
I/O0-15
CS
1
256K x 16
16
I/O16-31
2
A0-17
OE
WE
CS
WE
12
October 2000 Rev. 2