Patent ID: 7532054

Claim:
A semiconductor integrated circuit device comprising: a circuit that outputs a first signal which varies between a ground voltage and a second voltage higher than the ground voltage; and an output circuit including a level up converter that receives the first signal and that outputs a second signal which varies between the ground voltage and a third voltage higher than the second voltage, a pre-buffer that receives the second signal and that outputs a third signal which varies between the ground voltage and the third voltage, and a main buffer that receives the third signal and that outputs a fourth signal which varies between the ground voltage and a fourth voltage between the second voltage and the third voltage, wherein the circuit is supplied with the ground voltage and the second voltage, wherein the level up converter and the pre-buffer are supplied with the ground voltage and the third voltage, wherein the main buffer is supplied with the ground voltage and the fourth voltage, and wherein a driving force of the pre-buffer is larger than a driving force of the level up converter.