DESCRIPTION

The M48T39Y TIMEKEEPER? RAM is a non-volatile 262,144 bit static RAM and real time clock organized as 32,768 words by 8 bits. System integration features include Programmable Alarms, Watchdog Timer and Interval Timer. The special 32-pin DIP package provides a highly integrated battery back-up memory and real time clock solution.

■ INTEGRATED ULTRA LOW POWER SRAM, REAL TIME CLOCK, POWER-FAIL CONTROL CIRCUIT, BATTERY and CRYSTAL

■ BCD CODED YEAR, MONTH, DAY, DATE, HOURS, MINUTES and SECONDS

■ AUTOMATIC POWER-FAIL CHIP DESELECT and WRITE PROTECTION

■ WRITE PROTECT VOLTAGE (VPFD = Power-fail Deselect Voltage): – M48T39Y: 4.20V ≤ VPFD ≤ 4.50V

■ PROGRAMMABLE INTERRUPTS and SQUARE WAVE OUTPUT

■ WATCHDOG TIMER RESTARTS on OUT-OF-CONTROL PROCESSOR

■ CLOCK ACCURACY IS BETTER THAN ±1 MINUTE per MONTH at 25°C

■ 10 YEARS of DATA RETENTION and CLOCK OPERATION in the ABSENCE of POWER

■ SELF-CONTAINED BATTERY and CRYSTAL in DIP PACKAGE

■ PROGRAMMABLE ALARM OUTPUT ACTIVE in the BATTERY BACK-UP MODE

■ PIN and FUNCTION COMPATIBLE with DS1386