edi88257c White Electronic Designs Corporation, edi88257c Datasheet

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edi88257c

Manufacturer Part Number
edi88257c
Description
256kx8 Monolithic Sram
Manufacturer
White Electronic Designs Corporation
Datasheet

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256Kx8 Monolithic SRAM
FEATURES
White Electronic Designs Corp. reserves the right to change products or specifi cations without notice.
September 1999
Rev. 2
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
DQ0
DQ1
DQ2
A16
A14
A12
V
NC
A7
A6
A5
A4
A3
A2
A1
A0
SS
White Electronic Designs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TOP VIEW
32 DIP
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
V
A15
A17
W#
A13
A8
A9
A11
G#
A10
E#
I/O7
I/O6
I/O5
I/O4
I/O3
CC
A0-17
W#
FIGURE 1 – PIN CONFIGURATION
G#
E#
Address
Buffer
BLOCK DIAGRAM
1
Memory Array
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.
Decoder
Address
White Electronic Designs Corporation • (602) 437-1520 •www.whiteedc.com
Circuits
I/O
DQ0-7
A0-17
W#
E#
G#
DQ0-7
V
V
NC
CC
SS
PIN DESCRIPTION
Address Inputs
Write Enable
Chip Enable
Output Enable
Data Inputs/Outputs
Power (+5V ±10%)
Ground
Not Connected
EDI88257C

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edi88257c Summary of contents

Page 1

... White Electronic Designs Corp. reserves the right to change products or specifi cations without notice. September 1999 Rev. 2 The EDI88257C 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 ...

Page 2

... 2.1mA -1.0mA OH OH Figure 2 Vcc 480Ω Q 5pF 255Ω 2 White Electronic Designs Corporation • (602) 437-1520 •www.whiteedc.com EDI88257C TRUTH TABLE E# W# Mode Output H X Standby High Output Deselect High Read Data Out L L Write ...

Page 3

... EHDX WLQZ WHZ DVWH DVEH WHQX WLZ 3 White Electronic Designs Corporation • (602) 437-1520 •www.whiteedc.com EDI88257C 85ns 100ns Min Max Min Max 85 100 85 100 85 100 85ns ...

Page 4

... HIGH Z WRITE CYCLE 1, W# CONTROLLED t AVAV t AVEH t ELEH t AVEL t WLEH t DVEH DATA VALID HIGH Z WRITE CYCLE 2, E# CONTROLLED 4 White Electronic Designs Corporation • (602) 437-1520 •www.whiteedc.com EDI88257C t AVAV t AVQV t t ELQV EHQZ t ELQX t GLQV t GHQZ t GLQX READ CYCLE 2 (W# HIGH) t WHAX ...

Page 5

... CCDR ≥ V -0.2V 0 CDR ≤ 0. AVAV DATA RETENTION MODE 4.5V 4. CDR -0.2V CC DATA RETENTION, E# CONTROLLED 5 White Electronic Designs Corporation • (602) 437-1520 •www.whiteedc.com EDI88257C Typ Max Units – – V – 185 μA – – ns – – ...

Page 6

... TYP 15 x 0.100 = 1.500 ALL DIMENSIONS ARE IN INCHES ORDERING INFORMATION EDI 8 8 257 -55°C to +125°C -40°C to +85°C 0°C to +70°C 6 White Electronic Designs Corporation • (602) 437-1520 •www.whiteedc.com EDI88257C 0.620 0.600 0.600 NOM ...

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