SUMMARY DESCRIPTION
The M48T59/Y/V TIMEKEEPER® RAM is an 8 Kb x8 non-volatile static RAM and real time clock. The monolithic chip is available in two special packages to provide a highly integrated battery backed-up memory and real time clock solution.
   
FEATURES SUMMARY
■ INTEGRATED ULTRA LOW POWER SRAM,
    REAL TIME CLOCK, POWER-FAIL
    CONTROL CIRCUIT, AND BATTERY
■ FREQUENCY TEST OUTPUT FOR REAL
    TIME CLOCK SOFTWARE CALIBRATION
■ AUTOMATIC POWER-FAIL CHIP
    DESELECT AND WRITE PROTECTION
■ WRITE PROTECT VOLTAGES
    (VPFD = Power-fail Deselect Voltage):
    – M48T59: VCC = 4.75 to 5.5V
        4.5V ≤ VPFD ≤ 4.75V
    – M48T59Y: VCC = 4.5 to 5.5V
        4.2V ≤ VPFD ≤ 4.5V
    – M48T59V*: VCC = 3.0 to 3.6V
        2.7V ≤ VPFD ≤ 3.0V
■ SELF-CONTAINED BATTERY AND
    CRYSTAL IN THE CAPHAT™ DIP
    PACKAGE
■ PACKAGING INCLUDES A 28-LEAD SOIC
    AND SNAPHAT® TOP (to be ordered
    separately)
■ SOIC PACKAGE PROVIDES DIRECT
    CONNECTION FOR A SNAPHAT TOP
    WHICH CONTAINS THE BATTERY AND
    CRYSTAL
■ MICROPROCESSOR POWER-ON RESET
    (Valid even during battery back-up mode)
■ PROGRAMMABLE ALARM OUTPUT
    ACTIVE IN THE BATTERY BACK-UP MODE
■ BATTERY LOW FLAG