32K X 8 High Speed CMOS Static RAM
W24257
GENERAL DESCRIPTION
32K × 8 CMOS STATIC RAM
The W24257 is a slow speed, low power CMOS static RAM organized as...
Description
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
A12
A7 A6 A5 A4 A3 A2 A1 A0 I/O1 I/O2
I/O3 V SS
1 2 3 4 5 6 7 8 9 10
11
12 13 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
A11 A9 A8
A13 #WE VDD
A14 A12
A7 A6
A5 A4 A3
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28-pin TSOP
28 A10 27 #CS 26 I/O8 25 I/O7 24 I/O6 23 I/O5 22 I/O4 21 VSS 20 I/O3 19 I/O2 18 I/O1 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
W24257
TRUTH TABLE
#CS #OE #WE HXX L HH L ...
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