View max6715-max6729 datasheet:

19-2325; Rev 0; 1/02 Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits General Description Features The MAX6715–MAX6729 are ultra-low-voltage microproces- VCC1 (primary supply) Reset Threshold Voltages sor (µP) supervisory circuits designed to monitor two or three from 1.58V to 4.63V system power-supply voltages. These devices assert a sys- VCC2 (secondary supply) Reset Threshold tem reset if any monitored supply falls below its factory- Voltages from 0.79V to 3.08V trimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their Externally Adjustable RSTIN Threshold for thresholds. The integrated dual/triple supervisory circuits sig- Auxiliary/Triple-Voltage Monitoring nificantly improve system reliability an