M48T212V Datasheet - STMicroelectronics

DESCRIPTION
The M48T212Y/V are self-contained devices that include a real time clock (RTC), programmable alarms, a watchdog timer, and two external chip enable outputs which provide control of up to four (two in parallel) external low-power static RAMs.
   
FEATURES SUMMARY
■ INTEGRATED REAL TIME CLOCK,
    POWERFAIL CONTROL CIRCUIT, BATTERY AND
    CRYSTAL
■ CONVERTS LOW POWER SRAM INTO
    NVRAMs
■ YEAR 2000 COMPLIANT (4-Digit Year)
■ BATTERY LOW FLAG
■ MICROPROCESSOR POWER-ON RESET
■ PROGRAMMABLE ALARM OUTPUT
    ACTIVE IN THE BATTERY BACKED-UP
    MODE
■ WATCHDOG TIMER
■ AUTOMATIC POWER-FAIL CHIP
    DESELECT AND WRITE PROTECTION
■ CHOICE OF WRITE PROTECT VOLTAGES
    (VPFD = Power-fail Deselect Voltage):
    – M48T212Y: VCC = 4.5 to 5.5V
        4.2V ≤ VPFD ≤ 4.5V
    – M48T212V: VCC = 3.0 to 3.6V
        2.7V ≤ VPFD ≤ 3.0V
■ PACKAGING INCLUDES A 44-LEAD SOIC
    AND SNAPHAT® TOP (to be ordered
    separately)