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 SUMMARY
■ 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 x 8 SRAMs