MM58167B

MM58167B Microprocessor Real Time Clock October 1990 MM58167B Microprocessor Real Time Clock General Description 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 system for standby low power operation The time base is a 32 768 kHz crystal oscillator Y Y Y Y Y Y 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 oscillator Four-year calendar (no leap year) 24-hour clock Microprocessor compatible (8-bit data bus) Milliseconds through month counters Connection Diagrams Dual-In-Line Package PCC Package TL F 11070 – 1 Top View Order Number MM58167BN See NS Package Number N24A TL F 11070 – 2 Top View Order Number MM58167BV See NS Package Number V28A TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 11070 RRD-B30M105 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specificatio...