STMicroelectronics M41T81SMY6F Linear IC M41T81SMY6F Data Sheet

This is information on a product in full production. 

May 2012

Doc ID 10773 Rev 7

1/32

1

Serial access real-time clock (RTC) with alarms

−

■

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 I

2

C 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)

■

V

CC

 = 2.7 to 5.5 V

■

2.5 V 

≤ V

PFD

 

≤ 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)

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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

1

18

SO8

8-pin SOIC

SOX18

18-pin (300 mil) SOIC 

with embedded crystal