BUY MAX701CSA https://www.utsource.net/itm/p/45694.html
Power-Supply Monitor with Reset
Description: Low-Voltage, Low-Power, Single-Supply, CMOS Operational Amplifier Features: Low Supply Voltage Range: 2.7V to 5.5V Low Quiescent Current: 0.5mA Low Input Offset Voltage: 0.5mV Low Input Bias Current: 0.1nA High Open-Loop Gain: 100dB High Slew Rate: 0.6V/μs Low Output Voltage Swing: 0.2V Wide Common-Mode Range: 0.2V to V+ - 1.5V Low Noise: 0.9μVrms Unity-Gain Stable Applications: Battery-Powered Systems Portable Instrumentation Portable Medical Instruments Portable Communications Active Filters Portable Data Acquisition Systems (For reference only)