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MM58167B Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MM58167B Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page TLF11070 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 microproc- essor 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 32768 kHz crystal oscillator Features Y Microprocessor compatible (8-bit data bus) Y Milliseconds through month counters Y 56 bits of RAM with comparator to compare the real time counter to the RAM data Y 2 INTERRUPT OUTPUTS with 8 possible interrupt signals Y POWER DOWN input that disables all inputs and out- puts except for one of the interrupts Y Status bit to indicate rollover during a read Y 32768 kHz crystal oscillator Y Four-year calendar (no leap year) Y 24-hour clock Connection Diagrams Dual-In-Line Package TLF11070 – 1 Top View Order Number MM58167BN See NS Package Number N24A PCC Package TLF11070 – 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 RRD-B30M105Printed in U S A |
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