Features

■ Integrated, ultra low power SRAM, real-time

clock, power-fail control circuit, battery, and

crystal

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

hours, minutes, and seconds

■ Battery low warning flag

■ Automatic power-fail chip deselect and WRITE

protection

■ Two WRITE protect voltages:

(VPFD = power-fail deselect voltage)

– M48T129Y: VCC = 4.5 to 5.5 V;

4.2 V ≤ VPFD ≤ 4.5 V

– M48T129V: VCC = 3.0 to 3.6 V;

2.7 V ≤ VPFD ≤ 3.0 V

■ 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 DIP

package

■ Microprocessor power-on reset

(valid even during battery backup mode)

■ Programmable alarm output active in battery

backup mode

■ RoHS compliant

– Lead-free second level interconnect