Voltage comparator

A voltage comparator comprising:

• a positive feedback circuit having first and second inverters each having an input terminal connected to an output terminal of the other inverter, said positive feedback circuit comparing a potential of an input terminal of said first inverter with a potential of an input terminal of said second inverter and outputting the comparison result from an output terminal of said second inverter;
• a first input circuit for supplying the first potential corresponding to an input comparison voltage to the input terminal of said second inverter;
• a second input circuit for supplying the second potential corresponding to an input reference voltage to the input terminal of said first inverter;
• a control circuit connected between a power supply terminal of said positive feedback circuit and a power supply terminal, said control circuit supplying a power supply voltage to said positive feedback circuit when an input control signal represents a comparison operation period to execute voltage comparison operation for comparing the first potential with the second potential by said positive feedback circuit, and stopping supplying the power supply voltage to set an initial state when the control signal represents an initialization period;
• a first reset circuit inserted between the input terminal of said second inverter and a ground terminal to reduce the first potential to a ground potential when the control signal represents the initialization period;
• and
• a second reset circuit inserted between the input terminal of said first inverter and the ground terminal to reduce the second potential to the ground potential when the control signal represents the initialization period.