An integrated circuit includes a node setting block connected to a reference node and suitable for setting a voltage level of the reference node to a reference voltage level, a plurality of control voltage generation units connected in series to a reference node and suitable for generating a plurality of control voltages of which voltage level is variable and a current sensing circuit suitable for sensing a variation of a current flowing through a signal transmission line by using the plurality of control voltages, the signal transmission line connected to an internal circuit and a voltage level of the signal transmission line being fixed.