M48T212A-85MH1TR中文資料意法半導體數據手冊PDF規(guī)格書

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