A temperature detector includes a pulse generator adapted to generate pulse signals based on temperature detecting signals, a first delay circuit adapted to delay the temperature detecting signals in accordance with different delay times and generate a plurality of first delayed signals, a second delay circuit adapted to delay the temperature detecting signals and generate a plurality of second delayed signals, a plurality of detectors adapted to compare the plurality of first delayed signals from the first delay circuit and the plurality of second delayed signals from the second delay circuit and generate compared values based on the pulse signals, a plurality of pads adapted to read outputs generated by the plurality of detectors, and a comparison unit adapted to compare temperature values read from the plurality of pads and current temperature values to determine an optimum detector that generates an optimum temperature value.