W24257S-70LL-TR Datasheet, PDF (1/10 Pages) Winbond – 32K × 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
• 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 )
PIN CONFIGURATION
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
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
VSS
A0
.
.
DECODER
A14
CORE
ARRAY
CS
OE ^CONTROL
WE
I/O1
.
DATA I/O
.
I/O8
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: May 2000
-1-
Revision A14