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