M41T81
Serial access Real-Time Clock with alarm
Feature summary
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Counters for tenths/hundredths of seconds,
seconds, minutes, hours, day, date, month,
year, and century
32KHz crystal oscillator integrating load
capacitance (12.5pF) providing exceptional
oscillator stability and high crystal series
resistance operation
Serial interface supports I
2
C bus (400kHz
protocol)
Ultra-low battery supply current of 0.6µA
(typ@3V)
2.0 to 5.5V clock operating voltage
Automatic switch-over and deselect circuitry
(for 3V application select M41T81S data sheet)
Power-down time stamp (HT bit) allowing
determination of time elapsed in battery back
up
Programmable alarm and interrupt function
(valid even during battery back-up mode)
Accurate programmable watchdog timer (from
62.5ms to 128s)
Software clock calibration to compensate
crystal deviation due to temperature
Operating temperature of –40 to 85°C
ECOPACK® package available
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8
1
SO8 (M)
8-pin SOIC
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July 2006
Rev 8
1/30
1
STMICROELECTRONICS [ STMICROELECTRONICS ]
