The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 08, 1994
Filed:
Mar. 30, 1992
Fumio Murabayashi, Ibaraki, JP;
Takashi Hotta, Hitachi, JP;
Masahiro Iwamura, Hitachi, JP;
Akiyoshi Osumi, Hitachi, JP;
Hitachi Ltd., Tokyo, JP;
Abstract
A semiconductor integrated circuit device is arranged to have a plurality of logic circuit blocks, a data signal path for interconnecting logic circuit blocks and for providing a function of interfacing a current-driven signal. The logic circuit block on a signal output side includes an output circuit connected to the data signal path and a switching element formed of an NMOS transistor for controlling current flowing through the data signal path in response to an input signal applied to an input terminal of the output circuit. The logic circuit block on a signal input side includes an input circuit connected to the data signal path. The input circuit includes a bipolar transistor having an emitter connected to a constant current source, a collector forming an output terminal, and a base set at a fixed potential. The data signal path led from the output circuit is connected to the emitter of the bipolar transistor. The arrangement results in reducing a signal amplitude on the signal bus, thereby speeding up the transmission of the data signal and reducing noise of the signal.