MM58167B

Microprocessor compatible (8-bit data bus)
Milliseconds through month counters
56 bits of RAM with comparator to compare the real time counter to the RAM data
2 INTERRUPT OUTPUTS with 8 possible interrupt signals
POWER DOWN input that disables all inputs and outputs except for one of the interrupts
Status bit to indicate rollover during a read
32.768 kHz crystal oscillator
Four-year calendar (no leap year)
24-hour clock

The MM58167B is a low threshold metal gate CMOS circuit that functions as a real time clock in bus oriented microprocessor systems. The MM58167B includes an addressable real time counter, 56 bits of RAM, and two interrupt outputs. A POWER DOWN input allows the chip to be disabled from the rest of the system for standby low power operation. The time base is a 32.768 kHz crystal oscillator.