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MM58174AN Datasheet

  • MM58174AN

  • Microprocessor-Compatible Real-Time Clock

  • 133.34KB

  • 8頁(yè)

  • NSC

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MM58174A Microprocessor-Compatible Real-Time Clock
May 1991
MM58174A
Microprocessor-Compatible Real-Time Clock
General Description
The MM58174A is a low-threshold metal-gate CMOS circuit
that functions as a real-time clock and calendar in bus-ori-
ented microprocessor systems The device includes an in-
terrupt timer which may be programmed to one of three
times Timekeeping is maintained down to 2 2V to allow low
power standby battery operation The timebase is generat-
ed from a 32768 Hz crystal-controlled oscillator
Y
Y
Y
Y
Y
TTL compatible
Low power standby operation (2 2V 10
mA)
Low cost internally biased oscillator
Low cost 16-pin dual-in-line package
Available for commercial and military temperature
ranges
Applications
Y
Y
Y
Y
Y
Y
Y
Y
Features
Y
Y
Y
Y
Y
Y
Microprocessor compatible
Tenths of seconds seconds tens of seconds minutes
tens of minutes day of week days tens of days
months tens of months independent registers
Automatic leap year calculation
Internal pull-ups to safeguard data
Protection for read during data changing
Independent interrupt system with open drain output
Point-of-sale terminals
Word processors
Teller terminals
Event recorders
Microprocessor-controlled instrumentation
Microprocessor time clock
TV VCR reprogramming
Intelligent telephone
Block Diagram
TL F 6681 鈥?1
FIGURE 1
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 6681
RRD-B30M105 Printed in U S A

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