Patent ID: 6522589
Filing Date: 2003-02-18
Classification: H01L

Abstract:
A semiconductor apparatus comprising:a first voltage detection circuit to which an input signal is inputted, configured to judge whether a potential of the input signal is higher or lower than a first reference potential, and output a first level signal if the potential of the input signal is judged to be higher; a second voltage detection circuit to which the input signal is inputted, configured to judge whether the potential of the input signal is higher or lower than a second reference potential, and output a second level signal if the potential of the input signal is judged to be lower; and an operation mode entry setting circuit configured to judge plural times whether or not output signals from the first and second voltage detection circuits coincide with predetermined levels in synchronization with an input clock signal, and make an enter of an operation mode if all of the judged-results show that the output signals coincide with the predetermined levels.