Patent ID: 8253453

Claim:
A low-voltage detection circuit, comprising: a voltage and current reference circuit for producing a reference current and a reference voltage; a first resistive element having one end coupled to a first power supply voltage terminal; a first transistor of a first conductivity type having a first current electrode coupled to another end of the first resistive element a second current electrode, and a control electrode connected to the second current electrode; a second transistor of a second conductivity type having a first current electrode coupled to the second current electrode of the first transistor, a control electrode coupled to the voltage and current reference circuit, and a second current electrode coupled to a second power supply voltage terminal wherein the second transistor is configured to minor the reference current; a third transistor of the first conductivity type having a first current electrode coupled to the first power supply voltage terminal, a second current electrode coupled to an output node, and a control electrode coupled to the control electrode of the first transistor; and a fourth transistor of the second conductivity type having a first current electrode coupled to the output node, a control electrode coupled to the voltage and current reference circuit, and a second current electrode coupled to the second power supply voltage terminal, wherein the fourth transistor is configured to mirror the reference current, wherein a voltage at the output node provides a low-voltage detection signal regarding a voltage at the first power supply voltage terminal.