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