Patent Number: 7,102,388

Title: Interface device and information processing system

Abstract: A first converter circuit converts a state signal, whose level is constant or slowly varies during a predetermine period of time, into a pulse signal to allow the signal to propagate across an electrically insulating area. A second converter circuit converts the pulse signal, which has propagated through an insulating circuit, into the original state signal or a signal having the same characteristics as the original state signal.

Inventors: Murabayashi; Fumio (Urizura, JP), Sase; Takashi (Hitachi, JP), Kikuchi; Mutsumi (Hitachi, JP), Watanabe; Atsuo (Hitachiota, JP), Amishiro; Masatsugu (Hitachi, JP), Tabuchi; Kenji (Hitachinaka, JP)

Assignee: Hitachi, Ltd.

International Classification: H03K 19/0175 (20060101)

Expiration Date: 9/05/02018