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. 13, 1990
Filed:
Apr. 06, 1989
Shoji Matsushita, Tosashimizu, JP;
Masaharu Kimura, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
A semiconductor integrated circuit device includes an external terminal, an internal logic circuit, and an input/output interface circuit. The input/output interface circuit includes an input circuit, a selection circuit and an output circuit. The input circuit receives an input signal and supplies the internal logic circuit with the same. The selection circuit selects either the input signal supplied from the input circuit or an output signal supplied from the internal logic circuit. The output circuit outputs the selected one of the input signal and output signal to the external terminal. A loop circuit is formed by the input circuit, selection circuit and output circuit. The loop circuit logically includes an odd number of inverters.