A semiconductor integrated circuit device comprises a semiconductor substrate; an input and output terminal (1) formed on the semiconductor substrate; an input and output circuit (2, 3) formed on the semiconductor substrate, connected to the input and output terminal (1), and having an output buffer...http://www.google.ca/patents/US5448198?utm_source=gb-gplus-sharePatent US5448198 - Semiconductor integrated circuit device having circuitry for limiting forward junction current from a terminal
