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DP8572A Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. DP8572A
Description  Real Time Clock (RTC)
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com

DP8572A Datasheet(HTML) 1 Page - National Semiconductor (TI)

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May 1993
DP8572ADP8572AM Real Time Clock (RTC)
General Description
The DP8572A (8572AMmilitarized version) is intended for
use in microprocessor based systems where information is
required for multi-tasking data logging or general time of
daydate information This device is implemented in low
voltage silicon gate microCMOS technology to provide low
standby power in battery back-up environments The cir-
cuit’s architecture is such that it looks like a contiguous
block of memory or IO ports The address space is orga-
nized as 2 software selectable pages of 32 bytes This in-
cludes the Control Registers the Clock Counters the Alarm
Compare RAM and the Time Save RAM Any of the RAM
locations that are not being used for their intended purpose
may be used as general purpose CMOS RAM
Time and date are maintained from 1100 of a second to
year and leap year in a BCD format 12 or 24 hour modes
Day of week day of month and day of year counters are
provided Time is controlled by an on-chip crystal oscillator
requiring only the addition of the crystal and two capacitors
The choice of crystal frequency is program selectable
Power failure logic and control functions have been integrat-
ed on chip This logic is used by the RTC to issue a power
fail interrupt and lock out the mp interface The time power
fails may be logged into RAM automatically when VBB l
VCC Additionally two supply pins are provided When
VBB l VCC internal circuitry will automatically switch from
the main supply to the battery supply Status bits are provid-
ed to indicate initial application of battery power system
power and low battery detect
Full function real time clockcalendar
1224 hour mode timekeeping
Day of week and day of years counters
Four selectable oscillator frequencies
Parallel resonant oscillator
Power fail features
Internal power supply switch to external battery
Power Supply Bus glitch protection
Automatic log of time into RAM at power failure
On-chip interrupt structure
Periodic alarm and power fail interrupts
Up to 44 bytes of CMOS RAM
MIL-STD-883C compliant
5962-91641-01MJX (future)
Block Diagram
TLF9980 – 1
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M75Printed in U S A

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