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MM58167BV Datasheet

  • MM58167BV

  • Microprocessor Real Time Clock

  • 10頁

  • NSC

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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 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
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 out-
puts 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 鈥?1
Top View
Order Number MM58167BN
See NS Package Number N24A
TL F 11070 鈥?2
Top View
Order Number MM58167BV
See NS Package Number V28A
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 11070
RRD-B30M105 Printed in U S A

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