Power-on reset circuits with brownout detection and operation method thereof

Abstract

Power-on reset (POR) circuits with brownout detection, including small form factor and / or low-power / low-voltage POR circuits, are disclosed herein. In one embodiment, a POR circuit includes at least one current mirror and an inverter having an input coupled to the at least one current mirror. A voltage at the input of the inverter is based at least in part on (i) a current produced by the at least one current mirror and (ii) a power supply voltage. The POR circuit is configured to generate a power-on reset bar signal based at least in part on the output of the inverter. In some embodiments, the POR circuit can further include a Schmitt-trigger buffer coupled to the output of the inverter to provide hysteresis to the power-on reset bar signal.

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