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MM58274C Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. MM58274C
Description  Microprocessor Compatible Real Time Clock
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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MM58274C Datasheet(HTML) 1 Page - National Semiconductor (TI)

 
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TLF11219
April 1991
MM58274C
Microprocessor Compatible Real Time Clock
General Description
The MM58274C is fabricated using low threshold metal gate
CMOS technology and is designed to operate in bus orient-
ed microprocessor systems where a real time clock and cal-
endar function are required The on-chip 32768 kHz crystal
controlled oscillator will maintain timekeeping down to 22V
to allow low power standby battery operation This device is
pin compatible with the MM58174A but continues timekeep-
ing up to tens of years The MM58274C is a direct replace-
ment for the MM58274 offering improved Bus access cycle
times
Applications
Y
Point of sale terminals
Y
Teller terminals
Y
Word processors
Y
Data logging
Y
Industrial process control
Features
Y
Same
pin-out
as
MM58174A
MM58274B
and
MM58274
Y
Timekeeping from tenths of seconds to tens of years in
independently accessible registers
Y
Leap year register
Y
Hours counter programmable for 12 or 24-hour
operation
Y
Buffered crystal frequency output in test mode for easy
oscillator setting
Y
Data-changed flag allows simple testing for time
rollover
Y
Independent interrupting time with open drain output
Y
Fully TTL compatible
Y
Low power standby operation (10 mA at 22V)
Y
Low cost 16-pin DIP and 20-pin PCC
Block Diagram
TLF11219 – 1
FIGURE 1
TRI-STATE
is a registered trademark of National Semiconductor Corp
MicrobusTM is a trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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