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EDI88257CA Schematic ( PDF Datasheet ) - White Electronic Designs

Teilenummer EDI88257CA
Beschreibung 256K x 8 Monolithic SRAM
Hersteller White Electronic Designs
Logo White Electronic Designs Logo 




Gesamt 6 Seiten
EDI88257CA Datasheet, Funktion
White Electronic Designs
EDI88257CA
256Kx8 Monolithic SRAM
FEATURES
Access Times of 20, 25, 35, 45, 55ns
Data Retention Function (LPA Versions)
TTL Compatible Inputs and Outputs
Fully Static, No Clocks
Organized as 256Kx8
Commercial, Industrial and Military Temperature
Ranges
JEDEC Approved Evolutionary Pinout
• 32 pin Ceramic DIP, 0.6 mils wide (Package 9)
Single +5V (±10%) Supply Operation
The EDI88257CA is a 2 Megabit 256Kx8 bit Monolithic
CMOS Static RAM.
The 32 pin DIP pinout adheres to the JEDEC evolutionary
standard for the two megabit device. The device is
upgradeable to the 512Kx8 SRAM, the EDI88512CA. Pin
1 becomes the higher order address.
A Low Power version, EDI88257LPA, offers a data retention
function for battery back-up opperation. Military product is
available compliant to Appendix A of MIL-PRF-38535.
This product is subject to change without notice.
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
I/O0 13
I/O1 14
I/O2 15
VSS 16
32 VCC
31 A15
30 A17
29 WE#
28 A13
27 A8
26 A9
25 A11#
24 OE
23 A10
22 CS#
21 I/O7
20 I/O6
19 I/O5
18 I/O4
17 I/O3
BLOCK DIAGRAM
Memory Array
PIN DESCRIPTION
I/O0-7
A0-17
WE#
CS#
OE#
VCC
VSS
NC
Data Inputs/Outputs
Address Inputs
Write Enable
Chip Selects
Output Enable
Power (+5V ±10%)
Ground
Not Connected
A0-17
Address
Buffer
Address
Decoder
I/O
Circuits
I/O0-7
WE#
CS
OE#
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May 2000
Rev. 2
1 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com






EDI88257CA Datasheet, Funktion
White Electronic Designs
EDI88257CA
PACKAGE 9: 32 PIN SIDEBRAZED CERAMIC DIP (600mils wide)
1.616
1.584
Pin 1 Indicator
0.200
0.125
0.061
0.017
0.020
0.016
15 x 0.100 = 1.500
0.060
0.040
0.155
0.100 0.115
TYP
0.620
0.600
0.600
NOM
ALL DIMENSIONS ARE IN INCHES
ORDERING INFORMATION
WHITE ELECTRONIC DESIGNS
SRAM
ORGANIZATION, 256Kx8
TECHNOLOGY:
CA = CMOS Standard Power
LPA = Low Power
ACCESS TIME (ns)
PACKAGE TYPE:
C = 32 lead Sidebrazed DIP, 600 mil (Package 9)
DEVICE GRADE:
B = MIL-STD-883 Compliant
M = Military Screened
I = Industrial
C = Commercial
-55°C to +125°C
-40°C to +85°C
0°C to +70°C
EDI 8 8 257 CA X X X
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
May 2000
Rev. 2
6 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com

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