Patent ID: 8350593

Claim:
A semiconductor chip comprising: an output circuit including a first transistor and a second transistor, being interconnected in series and turned on or off complementarily, said output circuit outputting a signal to a first external terminal; and a third transistor connected in series with said first and second transistors and having a gate terminal connected to a second external terminal which is connected to a power supply of an external circuit, wherein said third transistor is connected between said first and second transistors, a first power supply voltage supply source; and an internal circuit outputting a signal to said output circuit; said first transistor having one terminal connected to said first power supply voltage supply source; said internal circuit comprising: a first internal circuit unit which outputs to a gate of said first transistor and a second internal circuit unit which outputs to a gate of said second transistor, wherein both said first and second internal circuits operating by a voltage supplied from said first power supply voltage supply source.