<p>When supply lines of clock signals (CK3, CK4) of a first type and clock signals (CK1, CK2) of a second type are both in the non-load state, the fall time of a clock pulse of the clock signal of the first type supplied to the supply line of the clock signal of the first type is longer than the fall time of a clock pulse of the clock signal of the second type supplied to the supply line of the clock signal of the second type.</p>
