Patent ID: 6927956

Claim:
A semiconductor integrated circuit device comprising: at least two internal circuits arranged internally in a circuit forming region, each of said two internal circuits having a different pair of power lines; a plurality of external signal input/output circuits having input protection circuits connected to input/output terminals outside said two internal circuits; an inter-circuit signal wire, different from said power lines, arranged to interconnect said two internal circuits, wherein said inter-circuit signal wire is not directly connected to said external signal input/output circuits; a first transistor forming an input element, connected to said inter-circuit signal wire, in one of said two internal circuits; and a plurality of second transistors, for protecting said first transistor, being arranged adjacent to said first transistor in said one of said two internal circuits and including a transistor of an identical structure to said first transistor, wherein gates of said plurality of second transistors are connected only to said power lines of said one of said two internal circuits.