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M48T212A Datasheet 3.3v Timekeeper Controller

Manufacturer: STMicroelectronics

Overview: M48T212A 3.3V TIMEKEEPER® CONTROLLER PRELIMINARY DATA s CONVERTS LOW POWER SRAM into NVRAMs YEAR 2000 PLIANT (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 4 A0-A3 A E EX W G WDI RSTIN1 RSTIN2 X0 XI M48T212A IRQ/FT RST E1CON E2CON VCCSW VOUT s s s s 44 1 SOH44 (MH) s s s s s Figure 1.

General 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.

A built-in 32.768 kHz oscillator (external crystal controlled) is used for the clock/calendar function.

Access to all TIMEKEEPER functions and the external RAM is the same as conventional byte-wide SRAM.

Key Features

  • Timing EX tEXPD A tEXPD E1CON tAPD E2CON.

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M48T212A Distributor