Summary description
The M48T02/12 TIMEKEEPER® RAM is a 2Kb x 8 non-volatile static RAM and real time clock which is pin and functional compatible with the DS1642.
   
Features
■ Integrated, ultra low power SRAM, real time
    clock, and power-fail control circuit
■ BYTEWIDE™ RAM-like clock access
■ BCD coded year, month, day, date, hours,
    minutes, and seconds
■ Typical clock accuracy of ±1 minute a month, at
    25°C
■ Software controlled clock calibration for high
    accuracy applications
■ Automatic power-fail chip deselect and WRITE
    protection
■ WRITE protect voltages
    (VPFD = Power-fail deselect voltage):
    – M48T02: VCC = 4.75 to 5.5V
        4.5V ≤ VPFD ≤ 4.75V
    – M48T12: VCC = 4.5 to 5.5V
        4.2V ≤ VPFD ≤ 4.5V
■ Self-contained battery and crystal in the
    CAPHAT™ DIP package
■ Pin and function compatible with JEDEC
    standard 2K x8 SRAMs
■ RoHS compliant
    – Lead-free second level interconnect