EDI88257C Datasheet, PDF (1/6 Pages) White Electronic Designs Corporation – 256Kx8 Monolithic SRAM

White Electronic Designs
EDI88257C
256Kx8 Monolithic SRAM
FEATURES
256Kx8 CMOS Static
Random Access Memory
• Access Times of 70, 85, 100ns
• Data Retention Function (LP Versions)
• TTL Compatible Inputs and Outputs
• Fully Static, No Clocks
JEDEC Approved Pinout
• 32 pin Ceramic DIP, 0.6 mils wide (Package 9)
■ Single +5V (±10%) Supply Operation
The EDI88257C is a 2 Megabit 256Kx8 bit Monolithic
CMOS Static RAM.
The 32 pin DIP pinout adheres to the JEDEC standard for
the two megabit device, and is a pin replacement for the
256Kx8 module, EDI88257C. The device is upgradeable
to the 512Kx8 SRAM, the EDI88512C. Pin 1 becomes the
higher order address.
A Low Power version, EDI88257LP, offers a data retention
function for battery back-up opperation. Military product is
available compliant to Appendix A of MIL-PRF-38535.
FIGURE 1 – PIN CONFIGURATION
32 DIP
TOP VIEW
NC 1
A16 2
A14 3
A12 4
A7 5
A6 6
A5 7
A4 8
A3 9
A2 10
A1 11
A0 12
DQ0 13
DQ1 14
DQ2 15
VSS 16
32 VCC
31 A15
30 A17
29 W#
28 A13
27 A8
26 A9
25 A11
24 G#
23 A10
22 E#
21 I/O7
20 I/O6
19 I/O5
18 I/O4
17 I/O3
A0-17
BLOCK DIAGRAM
Memory Array
PIN DESCRIPTION
A0-17
W#
E#
Address Inputs
Write Enable
Chip Enable
G#
DQ0-7
VCC
VSS
NC
Output Enable
Data Inputs/Outputs
Power (+5V ±10%)
Ground
Not Connected
Address
Buffer
Address
Decoder
I/O
Circuits
DQ0-7
W#
E#
G#
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
September 1999
Rev. 2
1
White Electronic Designs Corporation • [phone] • www.wedc.com