Patent ID: 8072033

Claim:
A semiconductor device, comprising: an output circuit region shaped approximately as a rectangle having a long side and a short side; and an electrostatic protection element region which is formed along said long side of said output circuit region and which has a substantially rectangular shape having a long side approximately equal in length to said long side of said output circuit region, wherein said electrostatic protection element region includes: a single first diffusion region of a first conductivity type which mostly extends from one end to an other end of said long side in said electrostatic protection element; a second diffusion region of a second conductivity type formed on the single first diffusion region and which acts as a cathode; and a third diffusion region of the first conductive type formed on the single first diffusion region and which acts as an anode, wherein said first, second, and third diffusion regions forming a single diode structure approximately equal in length to said long side of said output region, wherein said output circuit region comprises a plurality of output circuits, wherein each of said plurality of output circuits includes a first channel type transistor formed in a first region and a second channel type transistor formed in a second region, and wherein said electrostatic protection element region is formed between said first region and said second region.