DESCRIPTION
The DS1603 is a real time clock/elapsed time counter designed to count seconds when VCC power is applied and continually count seconds under battery backup power with an additional counter regardless of the condition of VCC.

FEATURES
■ Two 32–bit counters keep track of real time
   and elapsed time
■ Counters keep track of seconds for over 125
   years
■ Battery powered counter counts seconds from
   the time battery is attached until VBAT is less
   than 2.5 volts
■ VCC powered counter counts seconds while
   VCC is above 4.25 volts and retains the count
   in the absence of VCC under battery backup
   power
■ Clear function resets selected counter to 0
■ Read/Write serial port affords low pin count
■ Powered internally by a lithium energy cell
   that provides over 10 years of operation
■ 1-byte protocol defines read/write, counter
   address and software clear function
■ Self-contained crystal provides an accuracy of
   ±2 min per month
■ Operating temperature range of 0°C to 70°C
■ Low profile SIP module