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ADVANCED INFORMATION

Rev. 00E

01/12/05

IS34C02

Copyright © 2005 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.

2K-bit 2-WIRE SERIAL CMOS EEPROM

with Permanent Write-Protection

FEATURES

– Bidirectional data transfer protocol

– 400 kHz (2.5V) and 1 MHz (5.0V) compatibility

• Organization:

– 256 x 8-bit

• Data Protection Features

– Write Protect Pin

– Permanent Software Protection

• 16-Byte Page Write Buffer

– Partial Page-writes permitted

• Low Power CMOS Technology

– Active Current less than 2 mA (5V)

– Standby Current less than 6 µA (5V)

– Standby Current less than 2 µA (2.5V)

• Low Voltage Operation

– IS34C02-2: Vcc = 1.8V to 5.5V

– IS34C02-3: Vcc = 2.5V to 5.5V

ADVANCED INFORMATION

JANUARY 2005

• Random or Sequential Read Modes

• Filtered Inputs for Noise Suppression

• Self timed Write cycle with auto clear

– 5 ms @ 2.5V

• High Reliability

– Endurance: 1,000,000 Cycles

– Data Retention: 40 Years

• Automotive and Industrial temperature ranges

• 8-pin SOIC, 8-pin TSSOP, and 8-pin MSOP

• Lead-free available

DESCRIPTION

The IS34C02 is an electrically erasable PROM device

that uses the standard 2-wire interface for

communications. The IS34C02 contains a memory

array of 2,048-bits (256K x 8), and is further subdivided

into 16 pages of 16 bytes each for page-write mode.

The software write-protection feature is initiated with a

unique irreversible instruction. After this command is

transmitted, the first 128 bytes of the array become

permanently read-only. This feature is popular in

applications like DRAM DIMMs to retain DRAM related

data. This EEPROM is offered in wide operating voltages

3) to be compatible with most application voltages. ISSI

designed the IS34C02 as a low-cost and low-power 2-

wire EEPROM solution. The devices are packaged in

8-pin SOIC, and 8-pin TSSOP, and 8-pin MSOP.

The IS34C02 maintains compatibility with the popular 2-

wire bus protocol, so it is easy to use in applications

implementing this bus type. The simple bus consists of

the Serial Clock wire (SCL) and the Serial Data wire

(SDA). Using the bus, a Master device such as a

microcontroller is usually connected to one or more

Slave devices such as the IS34C02. The bit stream

over the SDA line includes a series of bytes, which

identifies a particular Slave device, an instruction, an

address within that Slave device, and a series of data, if

appropriate. The IS34C02 has a Write Protect pin (WP)

to allow blocking of any write instruction transmitted over

the bus.