DS1672

·32-bit counter
·2-wire serial interface
·Automatic power-fail detect and switch circuitry
·Power-fail reset output
·Low-voltage oscillator operation (1.3V min.)
·Trickle charge capability

The DS1672 incorporates a 32-bit counter and power monitoring functions.  The 32-bit counter DS1672 is designed to count seconds and can be used to derive time of day, week, month, month, and year by using a software algorithm.  A precision temperature-compensated reference and comparator circuit monitors .  When an out-of-tolerance condition occurs, an internal power-fail signal is generated the status of V_CC  returns to an in-tolerance condition, the reset signal which forces the reset to the active state.  When V_CC is kept in the active state for 250 ms to allow the power supply and processor to stabilize.