Description:

The M41T00S is a low-power serial real-time clock (RTC) with a built-in 32.768 kHzoscillator (external crystal controlled). Eight bytes of the SRAM (see Table 2 on page 13) areused for the clock/calendar function and are configured in binary coded decimal (BCD)format. Addresses and data are transferred serially via a two line, bidirectional I2C interface.The built-in address register is incremented automatically after each WRITE or READ databyte.The M41T00S has a built-in power sense circuit which detects power failures andautomatically switches to the battery supply when a power failure occurs. The energyneeded to sustain the clock operations can be supplied by a small lithium button supplywhen a power failure occurs. The eight clock address locations contain the century, year,month, date, day, hour, minute, and second in 24-hour BCD format. Corrections for 28, 29(leap year - valid until year 2100), 30 and 31 day months are made automatically.The M41T00S is supplied in an 8-pin SOIC.

Features:

■ 2.0 to 5.5 V clock operating voltage

■ Counters for seconds, minutes, hours, day,date, month, year, and century

■ Software clock calibration

■ Automatic switchover and deselect circuitry(fixed reference)

– VCC = 2.7 to 5.5 V2.5 V ≤ VPFD ≤ 2.7 V

■ Serial interface supports I2C bus (400 kHzprotocol)

■ Low operating current of 300 µA

■ Oscillator stop detection

■ Battery or SuperCapTM backup

■ Operating temperature of –40 to 85 °C

■ Ultra-low battery supply current of 0.6 µA