M41T81S datasheet(1/32 Pages) STMICROELECTRONICS

Part #	M41T81S

Description	Serial access real-time clock (RTC) with alarms

PDF	32 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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1 / 32 page

This is information on a product in full production.

May 2012

Doc ID 10773 Rev 7

1/32

1

M41T81S

Serial access real-time clock (RTC) with alarms

Datasheet

− production data

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 compensate for

crystal deviation due to temperature)

■ Operating temperature of –40 to 85 °C

■ Package options include an 8-lead SOIC or

18-lead embedded crystal SOIC

8

1

18

SO8

8-pin SOIC

SOX18

18-pin (300 mil) SOIC

with embedded crystal

www.st.com

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