A semiconductor integrated circuit includes first and second bank groups, a first internal voltage control unit configured to generate a first enable pulse which is enabled when a first read operation or a first write operation is performed for banks included in the first bank group, and a first internal voltage generation unit configured to generate and supply a first internal voltage to the first bank group in response to the first enable pulse, wherein an enable period of the first enable pulse is set to be longer in the first write operation than in the first read operation.