Patent ID: 6953969
Filing Date: 2005-10-11
Classification: H01L,H03K

Abstract:
1. A semiconductor integrated circuit device comprising: an output circuit, wherein the output circuit comprises: an open-drain N-channel MOSFET; and an output terminal connected to a drain of the open-drain N-channel MOSFET, wherein the open-drain N-channel MOSFET comprises: a drain region formed of an N-type semiconductor layer; a P-type diffusion layer formed within the drain region; two high-concentration N-type impurity diffusion layers formed within the drain region so as to sandwich the P-type impurity diffusion layer; a low concentration N-type impurity diffusion region formed in contact with the drain region; and a drain electrode connected to the P-type impurity diffusion layer and to the two high-concentration N-type impurity diffusion layers, wherein there are provided a plurality of the output circuit, wherein a peripheral portion of the drain region of the open-drain N-channel MOSFET and a peripheral portion of a source region of the open-drain N-channel MOSFET each have, as seen in a plan view, a substantially circular shape or a substantially regular-polygonal shape with four or more sides, and gates of the open-drain N-channel MOSFET are formed in a net-like pattern.