IS62WV25616ALL
IS62WV25616BLL
256K x 16 LOW VOLTAGE,
JUNE 2011
ULTRA LOW POWER CMOS STATIC SRAM
FEATURES
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DESCRIPTION
The ISSI IS62WV25616ALL/IS62WV25616BLL are high-
High-speed access time: 55ns, 70ns
CMOS low power operation
36 mW (typical) operating
9 µW (typical) CMOS standby
TTL compatible interface levels
Single power supply
1.65V--2.2V Vdd (IS62WV25616ALL)
2.5V--3.6V Vdd (IS62WV25616BLL)
Fully static operation: no clock or refresh
required
Three state outputs
Data control for upper and lower bytes
Industrial temperature available
Lead-free available
speed, low power, 4M bit SRAMs organized as 256K words
by 16 bits. It is fabricated using ISSI's high-performance
CMOS technology. This highly reliable process coupled with
innovative circuit design techniques, yields high-performance
and low power consumption devices.
When CS1 is HIGH (deselected) or when CS1 is low and
both LB and UB are HIGH, the device assumes a standby
mode at which the power dissipation can be reduced down
with CMOS input levels.
Easy memory expansion is provided by using Chip Enable
and Output Enable inputs.The active LOW Write Enable (WE)
controls both writing and reading of the memory. A data byte
allows Upper Byte (UB) and Lower Byte (LB) access.
The IS62WV25616ALL/IS62WV25616BLL are packaged
in the JEDEC standard 44-Pin TSOP (TYPE II) and 48-pin
mini BGA (6mmx8mm).
FUNCTIONAL BLOCK DIAGRAM
DECODER
256K x 16
MEMORY ARRAY
I/O
DATA
CIRCUIT
A0-A17
COLUMN I/O
VDD
GND
I/O0-I/O7
Lower Byte
I/O8-I/O15
Upper Byte
CS1
OE
WE
UB
LB
CONTROL
CIRCUIT
Copyright © 2011 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 arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications
unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that:
a.) the risk of injury or damage has been minimized;
b.) the user assume all such risks; and
c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances
Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774
Rev. E
06/03/2011
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