Patent ID: 6066973
Filing Date: 2000-05-23
Classification: H03K

Abstract:
An input circuit for supplying a signal to an internal circuit, said input circuit comprising:an external signal input terminal which receives an external signal;a noise absorption circuit, coupled to said external input terminal, which absorbs a noise mixed in the external signal and which outputs a corresponding noise-absorbed external signal at an output thereof;a first power supply terminal which supplies a first potential;a second power supply terminal which supplies a second potential;a noise control circuit, coupled to the output of said noise absorption circuit and having first and second outputs, which includes a first capacitor coupled between the second output and said second power supply terminal, and a first resistor coupled between the second output and the output of said noise absorption circuit; anda voltage level converting circuit which converts a voltage level of the noise absorbed external signal to obtain a converted signal for outputting to the internal circuit, which is driving by the first and second potentials supplied by said first and second power supply terminals, respectively, and which includes a first input terminal coupled to said first output of said noise control circuit and a second input terminal coupled to said second output of said noise control circuit.