MM58167B Datasheet - National

MM58167B Microprocessor Real Time Clock

The MM58167B is a low threshold metal gate CMOS circuit that functions as a real time clock in bus oriented microprocessor systems The device 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 syst.

MM58167B Features

* Y Y Y 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 oscill

MM58167B_NationalSemiconductor.pdf