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M41T81S

STMicroelectronics
Part Number M41T81S
Manufacturer STMicroelectronics
Description Serial access real-time clock
Published Apr 30, 2010
Detailed Description M41T81S Serial access real-time clock (RTC) with alarms Features ■ Counters for tenths/hundredths of seconds, seconds,...
Datasheet PDF File M41T81S PDF File

M41T81S
M41T81S

Overview
M41T81S Serial access real-time clock (RTC) with alarms Features ■ Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century ■ 32 KHz crystal oscillator with integrated load capacitance (12.
5 pf) which provides exceptional oscillator stability and high crystal series resistance operation) ■ Oscillator stop detection (monitors clock operation) ■ Serial interface supports I2C bus (400 kHz protocol) ■ Ultra-low battery supply current of 0.
6 µA (typ) ■ 2.
0 to 5.
5 V clock operating voltage ■ Automatic switchover and deselect circuitry (fixed reference) which provides full operation in 3.
0 V applications) ■ VCC = 2.
7 to 5.
5 V ■ 2.
5 V ≤ VPFD ≤ 2.
7 V ■ Power-down time-stamp (HT bit) which allows determination of time elapsed in battery backup ■ Battery low flag ■ Programmable alarm and interrupt function (valid even during battery backup mode) ■ Accurate programmable watchdog timer (from 62.
5 ms to 128 s) ■ Software clock calibration (to compensa...


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