IS23SC4418

IS23SC4418 IS23SC4418 IS23SC4428 IS23SC4428 ISSI NOVEMBER 2001 ISSI ® ® 1-KBYTE EEPROM WITH WRITE PROTECT FUNCTION AND PROGRAMMABLE SECURITY CODE (PSC) FEATURES www.DataSheet4U.com DESCRIPTION IS23SC4418 IS23SC4418 contains 1024 x 8 bits of EEPROM with programmable write protection for each byte. Random read access to any byte in the memory is always possible. The memory can also be erased and written byte by byte. Erasing old data in the byte location must be performed before new data can be written to the location. Each byte in the memory has a corresponding protect bit. The protect bits are only one-time programmable and cannot be erased. After the protect bits are enabled (logic 0), the corresponding bytes can never be changed again. A write-protect bit with data-compare function is available for user to verify the data in the memory before enabling the protect bit. Standard CMOS process 1024 x 8 bits EEPROM organization Byte-wise addressing Byte-wise erase/write Irreversible byte-wise write protection Single 5V power supply for read and write/erase Low power operation: – 3 mA typical active current 5 ms programming time 3-wire serial interface 20 KHz serial clock rate Contact configuration and serial interface, ISO standard 7816 (Synchronous Transmission) compatible. High ESD protection: > 4 KV High reliability: – 1,000,000 erase/write cycles guaranteed – 10 years data retention Wide operating temperature range – 0 to +70°C Commercial;...