The TS836 ultra low power integrated circuit incorporates a high stability band gap voltage reference and a comparator with open drain output. The threshold voltage is set at 4.5V for TS836-4 by internal thermally matched resistances. The comparator exhibits a 20s response (with 10mV overdrive) and has an open drain output active when input voltage is higher than the threshold. An internalhysteresisof 100mV increases the comparator's noise margin and prevents false reset operation.