GENERAL DESCRIPTION
The ADM803/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 ADM803 and ADM809 provide an active low reset signal (RESET), while the ADM810 provides an active high signal (RESET) output. The ADM809 and ADM810 have push-pull outputs whereas the ADM803 has an open-drain output, which requires an external pull-up resistor.

FEATURES
   Specified over Temperature
   Low Power Consumption (17 μA)
   Precision Voltage Monitor: 2.5 V, 3 V, 3.3 V, 5 V Options
   Reset Assertion Down to 1 V VCC
   140 ms Min Power-On Reset
      Open-Drain RESET Output (ADM803)
      Push-Pull RESET Output (ADM809)
      Push-Pull RESET Output (ADM810)
   SC70 and SOT-23 Packages

APPLICATIONS
   Microprocessor Systems
   Computers
   Controllers
   Intelligent Instruments
   Automotive Systems