Patent ID: 6472907
Filing Date: 2002-10-29
Classification: H03K

Abstract:
An input buffer of a semiconductor device which generates an internal signal in response to an external signal and supplies the internal signal to an internal circuit, including:a first comparator including first and second transistors of first conduction type, input electrodes of which receive said external signal and a reference signal respectively, said first comparator changing a first signal from a first level to a second level in response to the fact that the level of said external signal exceeds the level of said reference signal, a second comparator including third and fourth transistors of second conduction type, input electrodes of which receive said external signal and said reference signal respectively, said second comparator changing a second signal from said first level to said second level in response to the fact that the level of said external signal exceeds the level of said reference signal, and a logic circuit that changes said internal signal from an inactive level to an active level in response to the fact that either one of said first or second signal turns into a third level between said first and second levels.