View max8211-max8212 datasheet:

19-0539; Rev 3; 1/95 Microprocessor Voltage Monitors with Programmable Voltage Detection ________________General Description ____________________________Features Maxim’s MAX8211 and MAX8212 are CMOS micropower µP Power-Fail Warning voltage detectors that warn microprocessors (µPs) of Improved 2nd Source for ICL8211/ICL8212 power failures. Each contains a comparator, a 1.5V Low-Power CMOS Design bandgap reference, and an open-drain N-channel output driver. Two external resistors are used in conjunction with 5µA Quiescent Current the internal reference to set the trip voltage to the desired On-Board Hysteresis Output level. A hysteresis output is also included, allowing the user ±40mV Threshold Accuracy (±3.5%) to apply positive feedback for noise-free output switching.