EDI88257C Datasheet PDF - White Electronic Designs
| Part Number | EDI88257C | |
| Description | 256K x 8 Monolithic SRAM | |
| Manufacturers | White Electronic Designs | |
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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
A16
A14
A12
A7
A6
A5
A4
A3
A2
A1
A0
DQ0
DQ1
DQ2
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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 • (602) 437-1520 • www.wedc.com
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White Electronic Designs
EDI88257C
DATA RETENTION CHARACTERISTICS (EDI88257LP ONLY)
-55°C ≤ TA ≤ +125°C
Characteristic
Low Power Version only
Sym Conditions Min Typ Max
Data Retention Voltage
Data Retention Quiescent Current
VCC
ICCDR
VCC = 2.0V
E# ≥ VCC -0.2V
2
–
––
– 185
Chip Disable to Data Retention Time
Operation Recovery Time
tCDR VIN ≥ VCC -0.2V
0
TR
or VIN ≤ 0.2V
tAVAV
–
–
–
–
Units
V
µA
ns
ns
FIGURE 5 – DATA RETENTION - E# CONTROLLED
DATA RETENTION MODE
VCC
4.5V 4.5V
VCC
tCDR
tR
E# E# = VCC -0.2V
DATA RETENTION, E# CONTROLLED
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
September 1999
Rev. 2
5 White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for EDI88257C electronic component. |
| Information | Total 6 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ EDI88257C.PDF Datasheet ] | |
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