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W24257 Datasheet, PDF (1/10 Pages) Winbond – 32K X 8 CMOS STATIC RAM
W24257
GENERAL DESCRIPTION
32K × 8 CMOS STATIC RAM
The W24257 is a slow speed, low power CMOS static RAM organized as 32768 × 8 bits that operates
on a single 5-volt power supply. This device is manufactured using Winbond's high performance
CMOS technology.
FEATURES
• Low power consumption:
− Active: 325 mW (max.)
− Standby: 75 µW (max.) (LL-version)
150 µW (max.) (L-version)
• Access time: 70 nS (max.)
• Single +5V power supply
• Fully static operation
PIN CONFIGURATIONS
• All inputs and outputs directly TTL compatible
• Three-state outputs
• Battery back-up operation capability
• Data retention voltage: 2V (min.)
• Packaged in 28-pin 330 mil SOP,
standard type one TSOP (8 mm x 13.4 mm )
BLOCK DIAGRAM
A14
1
A12
2
A7
3
A6
4
A5
5
A4
6
A3
7
A2
8
A1
9
A0
10
I/O1
11
I/O2
12
I/O3
13
V SS
14
28-pin
SOP
28
V DD
27
#WE
26
A13
25
A8
24
A9
23
A11
22
#OE
21
A10
20
#CS
19
I/O8
18
I/O7
17
I/O6
16
I/O5
15
I/O4
VDD
V SS
A0
.
.
A14
DECODER
#CS
#OE
#WE
CONTROL
CORE
ARRAY
DATA I/O
I/O1
.
.
I/O8
#OE
1
A11
2
A9
3
A8
4
A13
5
#WE
6
VDD
7
A14
8
A12
9
A7
10
A6
11
A5
12
A4
13
A3
14
28-pin
TSOP
28
A10
27
#CS
26
I/O 8
25
I/O 7
24
I/O 6
23
I/O 5
22
I/O 4
21
VSS
20
I/O 3
19
I/O 2
18
I/O 1
17
A0
16
A1
15
A2
PIN DESCRIPTION
SYMBOL
A0−A14
I/O1−I/O8
#CS
#WE
#OE
VDD
VSS
DESCRIPTION
Address Inputs
Data Inputs/Outputs
Chip Select Input
Write Enable Input
Output Enable Input
Power Supply
Ground
Publication Release Date: February 2001
-1-
Revision A16