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:
Mar. 22, 1988
Filed:
Aug. 27, 1986
Yasuhiro Shin, Tokyo, JP;
Kazuhiko Yamada, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A CMOS output circuit including CMOS inverters, is formed on a semiconductor substrate and N MOS switching transistors are provided. The output circuit is responsive to an external control signal for switching a plurality of reference voltages and delivering them as multiple-level drive signals. The CMOS output circuit furthermore includes PMOS switching circuits connected in parallel with each of a plurality of CMOS transfer gates, CMOS inverters, and N MOS switching transistors for preventing a latch-up phenomenon of the CMOS inverters from being produced. The PMOS switching circuits are on-off controlled by a control signal obtained by converting an amplitude level of an external control signal.