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