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M41T81 Datasheet(PDF) 1 Page - STMicroelectronics

Part # M41T81
Description  Serial access Real-Time Clock with alarm
Download  30 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41T81 Datasheet(HTML) 1 Page - STMicroelectronics

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July 2006
Rev 8
1/30
1
M41T81
Serial access Real-Time Clock with alarm
Feature summary
■ 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 I2C 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
8
1
SO8 (M)
8-pin SOIC
www.st.com


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