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:
Jul. 07, 1992
Filed:
May. 14, 1990
Shigeichi Nakamura, Tokyo, JP;
Yujiro Yamashita, Yokohama, JP;
Makoto Inoue, Yokohama, JP;
Seiichi Sato, Tokyo, JP;
Namco Ltd., Tokyo, JP;
Abstract
An integrated circuit using, at least in its input end, a CMOS IC. This CMOS-input-type IC comprises an input terminal to which a signal is to be inputted, a switching signal terminal to which a switching signal for shifting from a main power source to a backup power source is to be inputted, and clamping means disposed between the input terminal and remaining parts of the CMOS-input-type-IC. The clamping means comprises an output buffer circuit which forcibly lowers or raises the signal, which is to be inputted to said input terminal, to a low level or a high level, respectively, when the switching signal is inputted to said switching signal terminal. With this clamping means, it is possible to prevent, for a long time, a rush current from generating in the CMOS-input-type IC when the power source is switched from the main power source to the backup power source, thus preventing the supply voltage from lowering.