MAX809 is a voltage detection chip used for voltage monitoring of digital system power supply, which  can work in industrial standard temperature range. MAX809 generates a reset signal, which goes low when the system power supply voltage drops to the  set value. When the system power supply voltage returns to the set value, the chip will set the reset  signal high after a delay time of at least 140ms. MAX809 series products can provide any set  detection voltage required by customers. At present, we will provide 7 for 5.0V,3.3V,3.0V and  2.Standard industrial voltage monitoring values of four kinds of 5V power supply voltages.