DESCRIPTION
The M48T212A is a self-contained device that includes 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.

■ CONVERTS LOW POWER SRAM into NVRAMs
■ YEAR 2000 COMPLIANT (4-Digit Year)
■ USES SUPER CAPACITOR or LITHIUM BATTERY (User Supplied)
■ BATTERY LOW FLAG
■ INTEGRATED REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT
■ AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION
■ WATCHDOG TIMER
■ WRITE PROTECT VOLTAGES (VPFD = Power-fail Deselect Voltage):
    – M48T212A: 2.7V ≤ VPFD ≤ 3.0V
■ MICROPROCESSOR POWER-ON RESET
■ PROGRAMMABLE ALARM OUTPUT ACTIVE in the BATTERY BACKED-UP MODE