AS7C33256PFS18B

December 2004 ® AS7C33256PFS18B 3.3V 256K × 18 pipeline burst synchronous SRAM Features Organization: 262,144 words × 18 bits Fast clock speeds to 200 MHz Fast clock to data access: 3.0/3.5/4.0 ns Fast OE access time: 3.0/3.5/4.0 ns Fully synchronous register-to-register operation Single-cycle deselect Asynchronous output enable control Available in 100-pin TQFP package Individual byte write and global write Multiple chip enables for easy expansion Linear or interleaved burst control Snooze mode for reduced power-standby Common data inputs and data outputs 3.3V core power supply 2.5V or 3.3V I/O operation with separate VDDQ www.DataSheet4U.com Logic block diagram LBO CLK ADV ADSC ADSP A[17:0] CLK CS CLR Burst logic 18 16 18 18 18 Q D CS Address register CLK 256K × 18 Memory array 18 GWE BWb BWE BWa CE0 CE1 CE2 D DQb Q CLK D DQa Q CLK D Byte Write registers Byte Write registers Enable register Q OE 2 Input registers CLK CE CLK ZZ Output registers CLK Power down D Enable Q delay register CLK OE 18 DQ [a,b] Selection guide –200 Minimum cycle time Maximum clock frequency Maximum clock access time Maximum operating current Maximum standby current Maximum CMOS standby current (DC) 5 200 3.0 375 130 30 –166 6 166 3.5 350 100 30 –133 7.5 133 4 325 90 30 Units ns MHz ns mA mA mA 12/10/04; v.1.7 Alliance Semiconductor P. 1 of 19 Copyright © Alliance Semiconductor. All rights reserved. AS7C33256PFS18B ® 4 Mb Synchronous SRAM prod...