Description
The M48T128Y/V TIMEKEEPER® RAM is a 128 Kb x 8 non-volatile static RAM and realtime clock. The special DIP package provides a fully integrated battery-backed memory and real-time clock solution. The M48T128Y/V directly replaces industry standard 128 Kb x 8 SRAM.

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 voltages (VPFD = power-fail deselect voltage):
    – M48T128Y: VCC = 4.5 to 5.5 V 4.1 V ≤ VPFD ≤ 4.5 V
    – M48T128V: VCC = 3.0 to 3.6 V 2.7 V ≤ VPFD ≤ 3.0 V
       (contact the ST sales office for availability)
■ 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