Patent ID: 7224192

Claim:
A voltage detection circuit, comprising: a constant-current circuit; a current mirror circuit operated by the constant-current circuit, the current mirror circuit having a first output and a second output; at least one diode-connected first transistor disposed between the first output of the current mirror circuit and a detected voltage; and an output circuit outputting one logic voltage in response to a turn-on of the at least one diode-connected first transistor when the detected voltage is a predetermined voltage or higher, and outputting the other logic voltage in response to a turn-off of the at least one diode-connected first transistor when the detected voltage is lower than the predetermined voltage, the output circuit comprising: a second transistor connected to the at least one diode-connected first transistor in a current mirror configuration, and a third transistor, a control electrode of which being connected to a junction between the second transistor and the second output of the current mirror circuit, the output circuit outputting the one logic voltage or the other logic voltage based on a turn-on or turn-off of the third transistor.