W24257

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 ...