M48T59 Datasheet - STMicroelectronics

DESCRIPTION
The M48T59/59Y/59V TIMEKEEPER® RAM is an 8Kb 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
■ 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: 4.5V ≤ VPFD ≤ 4.75V
    – M48T59Y: 4.2V ≤ VPFD ≤ 4.5V
    – M48T59V: 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