Datasheet > IS23SC4442

IS23SC4442

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
美国芯成 - ISSI		可编程只读存储器电动程控只读存储器电可擦编程只读存储器
页数	文件大小	规格书
21页	133K
描述
256 BYTE EEPROM WITH WRITE PROTECT FUNCTION AND PROGRAMMABLE SECURITY

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IS23SC4442 数据手册

IS23SC4442

ISSI

PRELIMINARYINFORMATION

August2003

256 BYTE EEPROM

WITH WRITE PROTECT FUNCTION AND

PROGRAMMABLE SECURITY

FEATURES

DESCRIPTION

IS23SC4442 contains 256 x 8 bits of EEPROM main

memory and a 32 x 1 bit protection PROM memory.

The main memory can be randomly accessed byte by

byte. During memory erase, all 8 bits of a byte are set

to logical one. During memory write, individual bit(s)

are set to logical zeros depend on the data value to be

written. Normally, a data change may consists of an

erase and a write operation. The write or erase operation

takes at least 2.5 ms to complete.

• Standard CMOS process

• 256 x 8 bits EEPROM organization

• Byte-wiseaddressing

• Irreversible byte-wise write protection of lowest

32 address (Byte 0..31)

• 3-byte Programmable Security Code (PSC) for

memorywrite/eraseprotection

• 2.7-5.5V power supply for read and write/erase

• Low power operation: 3 mA typical active current

• 2.5 ms programming time

The first 32 bytes (Address: 0 to 31) in memory are

irreversibly protected by the corresponding 32 protect

bits in the 32 x 1 bit protection memory. The 32 protect

bits are onetime programmable, and they cannot be

erased once they are set to logical zero.

IS23SC4442 provides a 3-bit Error Counter (EC), and

three bytes Programmable Security Code (PSC) to

preventunauthorizederase/writeoperationtothe

memory. All the memory, except the PSC, can be read

after the chip is powered on. But, the memory can be

written or erased only after the PSC is entered and

verified correct. After three successive unsuccessful

verifications of PSC, the Error Counter locks the chip

from a further attempt, and the memory can never be

erasedorwritten.

• 2-wire serial interface

• End of processing indication

• ISO standard 7816 compatible

• Highreliability:

– 1,000,000 erase/write cycles guaranteed

– 10 years data retention

• Wide operating temperature range

–30^oC to 75^oC

Copyright © 2003 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 — 1-800-379-4774

Rev. 00B

08/01/03

12 3 4 5 6 7...21

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