Features

· Counters for tenths/hundredths of seconds,

seconds, minutes, hours, day, date, month,

year, and century

· 32 KHz crystal oscillator integrating load

capacitance (12.5 pF) providing exceptional

oscillator stability and high crystal series

resistance operation

· Serial peripheral interface (2 MHz SPI)

· Ultralow battery supply current of 500 nA (max)

· 2.7 to 5.5 V operating voltage

· 2.5 to 5.5 V oscillator operating voltage

· Battery low flag

· Automatic switchover and deselect circuitry

· 44 bytes of general purpose RAM

· Programmable alarm and interrupt function

(valid even during battery backup mode)

· Accurate programmable watchdog timer (from

62.5 ms to 128 s)

· Microprocessor power-on reset

· Choice of power-fail deselect voltages

(VCC = 2.7 to 5.5 V):

– THS = VSS; 2.55 V £ VPFD £ 2.70 V

– THS = VCC; 4.20 V £ VPFD £ 4.50 V

· Packaging includes a 28-lead SOIC and

SNAPHAT® top (to be ordered separately) or

16-lead SOIC

· 28-lead SOIC package provides direct

connection for a SNAPHAT® top which

contains the battery and crystal

· RoHS compliant

– Lead-free second level interconnect