Patent ID: 6028338
Filing Date: 2000-02-22
Classification: H01L

Abstract:
A semiconductor integrated circuit device comprising:an internal circuit comprising a plurality of internal MOS transistors;a terminal group having an input terminal, an output terminal, a power supply terminal for supplying electrical power to the internal circuit, and a ground terminal;a peripheral portion disposed between the terminal group and the internal circuit and connected electrically to the terminal group and the internal circuit;an open drain transistor contained in the peripheral portion and connected electrically to the internal circuit and the output terminal, a drain terminal of the open drain transistor being electrically connected to the output terminal, and a gate electrode of the open drain transistor being electrically connected to the internal circuit; andat least one N-channel MOS transistor, a drain region of the N-channel MOS transistor being electrically connected to the output terminal, and a source region and a gate electrode of the N-channel MOS transistor both being electrically connected to the ground terminal;wherein the at least one N-channel MOS transistor has a source contact, a drain contact and a gate electrode, and a distance between the source contact and the gate electrode is set shorter than another distance between the drain contact and the gate electrode, such that the at least one N-channel MOS transistor has a channel structure effective to release an electrostatic stress more efficiently than the internal MOS transistors.