An integrated circuit may include an amplifier circuit configured to receive a pull-up voltage in response to a pull-up enable signal, receive a pull-down voltage in response to a pull-down enable signal, and amplify a voltage difference between a first line and a second line through the pull-up and pull-down voltages; a first delay path configured to generate the pull-down enable signal by delaying an input signal; and a second delay path configured to generate the pull-up enable signal by delaying the input signal, wherein a change in a delay of the first delay path due to variation of a power supply voltage is smaller than a change in a delay of the second delay path due to the variation.