DESCRIPTION
The X24257 is a CMOS Serial EEPROM, internally organized 32K x 8. The device features a serial inter face and software protocol allowing operation on a simple two wire bus.
Three device select inputs (S0–S1) allow up to four devices to share a common two wire bus.

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