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