DESCRIPTION
The M48T35/35Y TIMEKEEPER® RAM is a 32Kb 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.
   
■ INTEGRATED ULTRA LOW POWER SRAM,
    REAL TIME CLOCK, POWER-FAIL CONTROL
    CIRCUIT and BATTERY
■ BYTEWIDE™ RAM-LIKE CLOCK ACCESS
■ BCD CODED YEAR, MONTH, DAY, DATE,
    HOURS, MINUTES and SECONDS
■ FREQUENCY TEST OUTPUT for REAL TIME
    CLOCK
■ AUTOMATIC POWER-FAIL CHIP DESELECT
    and WRITE PROTECTION
■ WRITE PROTECT VOLTAGES
    (VPFD = Power-fail Deselect Voltage):
    – M48T35: 4.5V ≤ VPFD ≤ 4.75V
    – M48T35Y: 4.2V ≤ VPFD ≤ 4.5V
■ SELF-CONTAINED BATTERY and CRYSTAL
    in the CAPHAT DIP PACKAGE
■ SOIC PACKAGE PROVIDES DIRECT
    CONNECTION for a SNAPHAT HOUSING
    CONTAINING the BATTERY and CRYSTAL
■ SNAPHAT® HOUSING (BATTERY and
    CRYSTAL) is REPLACEABLE
■ PIN and FUNCTION COMPATIBLE with
    JEDEC STANDARD 32Kb x8 SRAMs