Power supply voltage monitoring circuit

A power supply voltage monitoring circuit comprising:

• an input terminal;
• an output terminal;
• a ground terminal;
• a voltage dividing circuit configured to generate a first divided voltage and a second divided voltage from a power supply voltage applied to the input terminal;
• a reference voltage source configured to generate a reference voltage based on the power supply voltage;
• a regulator voltage source configured to generate a regulator voltage higher than the reference voltage based on the power supply voltage;
• a comparator configured to generate a first binary output signal by comparing the reference voltage with the first divided voltage, using the regulator voltage as a driving source;
• a first switching part having a main conductive path connected between the output terminal and the ground terminal and responsive to the first binary output signal;
• and
• a second binary converting part configured to generate a second binary output signal in response to the second divided voltage, using the reference voltage as a driving source,
• wherein a binary power supply voltage monitoring output signal to monitor a magnitude of the power supply voltage is generated according to logical operation of the first binary output signal and the second binary output signal.