MM58167B Datasheet, PDF (1/10 Pages) National Semiconductor (TI) – 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 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 32 768 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 _{32 768 kHz crystal oscillator}
Y _{Four-year calendar (no leap year)}
Y _{24-hour clock}
Connection Diagrams
Dual-In-Line Package
PCC Package
Top View
Order Number MM58167BN
See NS Package Number N24A
TL F 11070 – 1
Top View
TL F 11070 – 2
Order Number MM58167BV
See NS Package Number V28A
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C1995 National Semiconductor Corporation TL F 11070
RRD-B30M105 Printed in U S A