Features

■ Integrated, ultra low power SRAM, real-time

clock, power-fail control circuit, battery, and

crystal

■ BCD coded year, month, day, date, hours,

minutes, and seconds

■ Automatic power-fail chip deselect and WRITE

protection

■ WRITE protect voltage

VCC = 4.5 to 5.5 V; 4.1 V ≤ VPFD ≤ 4.5 V

(VPFD = power-fail deselect voltage)

■ Conventional SRAM operation; unlimited

WRITE cycles

■ Software-controlled clock calibration for high

accuracy applications

■ 10 years of data retention and clock operation

in the absence of power

■ Self-contained battery and crystal in the DIP

package

■ Pin and function compatible with JEDEC

standard 128 K x 8 SRAMs

■ RoHS compliant

– Lead-free second level interconnect