Semiconductor integrated circuit device capable of outputting a plurality of interface levels

U.S. Patent Number: 5387809

Abstract: A semiconductor integrated circuit device includes an interface corresponding to a relatively high signal level; an interface corresponding to a relatively low signal level; and an internal circuit made responsive to a signal through either interface for generating a signal to be transmitted to the other interface. The interface corresponding to a relatively high level, the internal circuit, and a drive control circuit constituting the input circuit and output circuit of the interface corresponding to a relatively low level are operated by an operating voltage corresponding to the relatively high level. An output element of the output circuit in the interface corresponding to a relatively low level, which is to be driven by the drive control circuit, is operated by an operating voltage corresponding to the relatively low level.

Inventors: Yamagishi; Mikio (Ohme, JP), Koide; Kazuo (Iruma, JP), Nakano; Tetsuo (Hamura, JP)

Assignee: Hitachi, Ltd. (Tokyo, JP)

Application Number: 07/820,005

Issued: 1995-02-07

Expired: 2007-02-07

Classes: 257/203 ; 257/204; 257/207; 257/208; 257/E27.11

Field of search: 257/500,203,204,205,207,208 307/440,465.1

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