Patent ID: 7609094
Filing Date: 2009-10-27
Classification: H03K

Abstract:
1. An input circuit, comprising a level-determining unit for receiving an input signal at an input terminal of the input circuit and determining a voltage level of the input signal, wherein the level-determining unit receives a reference voltage and determines the voltage level of the input signal as a voltage level of the reference voltage when the input terminal is in a floating state; and an output unit coupled to the input terminal; wherein in a first period, the output unit outputs the input signal with the determined voltage level at an output terminal of the input circuit to serve as an output signal, the first period being controlled by a first enable signal; and wherein in a second period following the first period, the output unit latches the determined voltage level of the input signal according to a second enable signal and outputs the input signal with the determined voltage level at the output terminal to serve as the output signal.