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IS23SC4442 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 IS23SC4442
部品説明 256 BYTE EEPROM
メーカ ISSI
ロゴ ISSI ロゴ 



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IS23SC4442 Datasheet, IS23SC4442 PDF,ピン配置, 機能
IS23SC4442
ISSI®
256 BYTE EEPROM
WITH WRITE PROTECT FUNCTION AND
PROGRAMMABLE SECURITY
PRELIMINARY INFORMATION
August 2003
FEATURES
• Standard CMOS process
• 256 x 8 bits EEPROM organization
• Byte-wise addressing
• Irreversible byte-wise write protection of lowest
32 address (Byte 0..31)
• 3-byte Programmable Security Code (PSC) for
memory write/erase protection
• 2.7-5.5V power supply for read and write/erase
• Low power operation: 3 mA typical active current
• 2.5 ms programming time
• 2-wire serial interface
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• End of processing indication
• ISO standard 7816 compatible
• High reliability:
1,000,000 erase/write cycles guaranteed
10 years data retention
• Wide operating temperature range
30oC to 75oC
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.
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
prevent unauthorized erase/write operation to the
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
erased or written.
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
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. — www.issi.com — 1-800-379-4774
Rev. 00B
08/01/03
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