A semiconductor integrated circuit includes first and second external terminals receiving an external power supply voltage, an internal power supply line coupling to the first and second external terminals, a first transistor coupling between the first external terminal and the internal power supply line, a second transistor that is coupled between the second external terminal and the internal power supply line, a first monitor line coupling to a first node of the internal power supply line, a second monitor line coupling to a second node of the internal power supply line, the second node being different from the first node, and a controller coupling to the first and second monitor lines, the controller outputs a control signal corresponding to potentials of the first and second monitor lines to the first and second transistors.