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