IS61C25616AL IS61C25616AS
IS64C25616AL IS64C25616AS
256K x 16 HIGH-SPEED CMOS STATIC RAM
MARCH2008
FEATURES
DESCRIPTION
The ISSI IS61C25616AL/AS and IS64C25616AL/AS are
high-speed,4,194,304-bitstaticRAMsorganizedas262,144
words by 16 bits. They are fabricated using ISSI's high-
performanceCMOStechnology.Thishighlyreliableprocess
coupled with innovative circuit design techniques, yields
access times as fast as 12 ns with low power consumption.
HIGH SPEED: (IS61/64C25616AL)
• High-speed access time: 10ns, 12 ns
• Low Active Power: 150 mW (typical)
• Low Standby Power: 10 mW (typical)
CMOS standby
LOW POWER: (IS61/64C25616AS)
• High-speed access time: 25 ns
• Low Active Power: 75 mW (typical)
When CE is HIGH (deselected), the device assumes a
standbymodeatwhichthepowerdissipationcanbereduced
down with CMOS input levels.
• Low Standby Power: 1 mW (typical)
CMOS standby
Easy memory expansion is provided by using Chip Enable
andOutputEnableinputs,CEandOE.TheactiveLOWWrite
Enable(WE)controlsbothwritingandreadingofthememory.
A data byte allows Upper Byte (UB) and Lower Byte (LB)
access.
• TTL compatible interface levels
• Single 5V 10ꢀ power supply
• Fully static operation: no clock or refresh
required
The IS61C25616AL/AS and IS64C25616AL/AS are pack-
agedintheJEDECstandard44-pin400-milSOJand44-pin
TSOP (Type II).
• Available in 44-pin SOJ package and
44-pin TSOP (Type II)
• Commercial, Industrial and Automotive tempera-
ture ranges available
• Lead-free available
FUNCTIONAL BLOCK DIAGRAM
256K x 16
MEMORY ARRAY
A0-A17
DECODER
VDD
GND
I/O0-I/O7
Lower Byte
I/O
DATA
COLUMN I/O
CIRCUIT
I/O8-I/O15
Upper Byte
CE
OE
WE
CONTROL
CIRCUIT
UB
LB
Copyright © 2006 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability
arisingoutoftheapplicationoruseofanyinformation, productsorservicesdescribedherein. Customersareadvisedtoobtainthelatestversionofthisdevicespecificationbeforerelyingonany
publishedinformationandbeforeplacingordersforproducts.
Integrated Silicon Solution, Inc. — www.issi.com
1
Rev. C
03/21/2008