US Patent 7321235 Input circuit for an integrated circuit

An integrated circuit includes a functional circuit, a setting memory for storing a setting data item and an input circuit for receiving signals via an input terminal. The input circuit includes a first receiving circuit having first hysteresis and a second receiving circuit having second hysteresis wherein the input circuit connects either the first or the second receiving circuit to the input terminal on the basis of the setting data item in order to receive the signals and to provide the functional circuit with the signals.