View max8211 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 swit