View max6461-max6466 datasheet:

19-2533; Rev 0a; 10/02 Ultra-Low-Power Voltage Detectors and µP Supervisory Circuits General Description Features The MAX6461–MAX6466 family of ultra-low-power voltage Ultra-Low 1.0µA Supply Current detectors and µP reset supervisory circuits monitors bat- Preset Thresholds from +1.6V to +5.5V in 100mV tery, power-supply, and system voltages. Each circuit Increments includes a precision bandgap reference, a comparator, Internal 5% Threshold Hysteresis internally trimmed resistor networks that set specified trip thresholds, and an internal 5% threshold hysteresis circuit ±2.5% Threshold Accuracy Over Temperature (see the Functional Diagram). Output is asserted when Internal Timeout Period Option (150ms min) VCC falls below the internal VTH- and remains asserted until