Patent ID: 6653884
Filing Date: 2003-11-25
Classification: H01L,H03K

Abstract:
An input interface circuit for a semiconductor integrated circuit device comprising:a pair of diodes provided between a power supply and an outside input terminal and between the outside input terminal and ground, respectively; a first and a second PMOSFET connected in series between the power supply and an inside input terminal coupled to an internal circuit element of the semiconductor integrated circuit device; a first and a second NMOSFET connected in series between ground and the inside input terminal; a third PMOSFET connected in series between the outside input terminal and a gate of said first PMOSFET; a third NMOSFET connected in series between said outside input terminal and a gate of said second NMOSFET; and an intermediate voltage source applying a voltage which is between ground potential and a voltage of said power supply to a gate of each of said first NMOSFET, said second PMOSFET, said third PMOSFET, and said third NMOSFET.