GENERAL DESCRIPTION
The ADM809/ADM810 supervisory circuits monitor the power supply voltage in microprocessor systems. They provide a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for 240 ms. This holds the microprocessor in a reset state until conditions have stabilized. The RESET output remains operational with VCC as low as 1 V. The ADM809 provides an active low reset signal (RESET) while the ADM810 provides an active high signal (RESET) output.
Six reset threshold voltage options are available suitable for monitoring a variety of supply voltages. Refer to Table I. The reset comparator features built-in glitch immunity, making it immune to fast transients on VCC.
The ADM809/ADM810 consumes only 17 µA, making it suitable for low power portable equipment. It is packaged in a 3-pin SOT-23 package.

FEATURES
   Superior Upgrade for MAX809/MAX810
   Specified Over Temperature
   Low Power Consumption (17 mA)
   Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options
   Reset Assertion Down to 1 V VCC
   140 ms min Power-On Reset
      Logic Low RESET Output (ADM809)
      Logic High RESET Output (ADM810)
  
APPLICATIONS
   Microprocessor Systems
   Computers
   Controllers
   Intelligent Instruments
   Automotive Systems