Features

■ Counters for seconds, minutes, hours, day,

date, month, years, and century

■ 32 KHz crystal oscillator integrating load

capacitance (12.5 pF) providing exceptional

oscillator stability and high crystal series

resistance operation

■ Serial interface supports I2C bus (100 kHz

protocol)

■ Ultra-low battery supply current of 450 nA

(typ at 3 V)

■ 5 V ±10% supply voltage

■ Timekeeping down to 2.5 V

■ Automatic power-fail detect and switch circuitry

■ 56 bytes of general purpose RAM

■ Software clock calibration to compensate

crystal deviation due to temperature

■ Automatic leap year compensation

■ Operating temperature of –40 °C to 85 °C

■ Available in an 8-lead, 150-mil, plastic SOIC

(SO8)

■ RoHS compliant

– Lead-free second level interconnect