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