X24257

www.DataSheet4U.com Preliminary Information 256K X24257 400kHz 2-Wire Serial EEPROM with Block Lock™ DESCRIPTION 32K x 8 Bit FEATURES Save critical data with programmable block lock protection —Block lock (first page, first 2 pages, first 4 pages, first 8 pages, 1/4, 1/2, or all of EEPROM array) —Software write protection —Programmable hardware write protect In circuit programmable ROM mode 400kHz 2-wire serial interface —Schmitt trigger input noise suppression —Output slope control for ground bounce noise elimination Longer battery life with lower power —Active read current less than 1µA —Active write current less than 3µA —Standby current less than 1µA 2.5V to 5.5V power supply 64-byte page write mode —Minimizes total write time per word Internally organized 32K x 8 Bidirectional data transfer protocol Self-timed write cycle —Typical write cycle time of 5ms High reliability —Endurance: 100,000 cycles —Data retention: 100 years 8-lead XBGA, 8-lead SOIC, 14-lead TSSOP Three device select inputs (S0–S1) allow up to four devices to share a common two wire bus. A Write Protect Register at the highest address location, FFFFh, provides three write protection features: Software Write Protect, Block Lock Protect, and Programmable Hardware Write Protect. The Software Write Protect feature prevents any nonvolatile writes to the device until the WEL bit in the Write Protect Register is set. The Block Lock Protection feature gives the user eight array block protec...