● Precision Voltage Monitor: 3V, 3.3V, 5V Options

● Superior Upgrade for MAX803/MAX809/MAX810 and ADM803

   /ADM809/ADM810

● Fully Specified over Temperature

● VCC Transient Immunity

● Low Power Consumption: 240nA (TYP)

● Reset Assertion Down to 1V VCC

● 330ms Power-On Reset (TYP) 

   Open-Drain nRESET Output (SGM803B)

● -40℃ to +125℃ Operating Temperature Range

● Small Packaging

   SGM803B Available in SOT-23-3 and SOT-23

The SGM803B/SGM809B/SGM810B supervisory circuits monitor the power supply voltage in microprocessor and digital systems. They provide a reset output during power-up, power-down and brownout conditions. On power-up, an internal timer holds reset asserted for 330ms. This holds the microprocessor in a reset state until conditions have stabilized. The nRESET output remains operational with VCC as low as 1V. The SGM803B/SGM809B provides an active low reset signal (nRESET) while the SGM810B provides an active high signal (RESET) output. The SGM809B/SGM810B has push-pull outputs, whereas the SGM803B has an open-drain output, which requires an external pull-up resistor.

Five reset threshold voltage options are available suitable for monitoring 3V, 3.3V and 5V supply voltages.

The reset comparator features built-in glitch immunity, making it immune to fast transients on VCC.