IS65WV25616ALL

IS65WV25616BLL

1

Rev. 00B

06/20/06

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 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.

256K x 16 LOW VOLTAGE, ULTRA

LOW POWER CMOS STATIC SRAM

FEATURES

• 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

• Fully static operation: no clock or refresh

required

• Three state outputs

• Data control for upper and lower bytes

• TEMPERATURE OFFERINGS:

Option A1: -40°C to +85°C

Option A2: -40°C to +105°C

Option A3: -40°C to +125°C

• Lead-free available

DESCRIPTION

The

speed, low power, 4M bit SRAMs organized as 256K words

by 16 bits. It is fabricated using

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 IS65WV25616BALL/65WV25616BLL are packaged in

the JEDEC standard 44-Pin TSOP (TYPE II).

FUNCTIONAL BLOCK DIAGRAM

PRELIMINARY INFORMATION

JUNE 2006

A0-A17

CS1

OE

WE

256K x 16

MEMORY ARRAY

DECODER

COLUMN I/O

CONTROL

CIRCUIT

GND

I/O

DATA

CIRCUIT

I/O0-I/O7

Lower Byte

I/O8-I/O15

Upper Byte

UB

LB

25616LL_BLK.eps