Integrated circuit

A comparator circuit comprising:

• a comparator comparing voltages supplied to a first and a second input terminal and outputting a comparison result signal corresponding to a comparison result;
• an input switch receiving a reference voltage and an input voltage and supplying the reference voltage to one of the first and the second input terminal while supplying the input voltage to another one of the first and the second input terminal according to a switching signal;
• an output inverting/noninverting circuit outputting the comparison result signal after inverting or not inverting the signal according to the switching signal;
• a timer measuring an operating time of the comparator and outputting the switching signal according to a first predetermined time period and a second predetermined time period;
• and
• an offset detector detecting an offset of the comparator and setting the first predetermined time period and the second predetermined time period.