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:
Aug. 17, 1993
Filed:
Jul. 15, 1991
Hideaki Sadamatsu, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A semiconductor integrated circuit arrangement prevents the occurrence of latch up. The circuit includes a first semiconductor island of a first conductivity type and a second semiconductor island of the first conductivity type located within a base semiconductor region of a second conductivity type. A resistive diffusion region of the second conductivity type is located within the first semiconductor island region. The second semiconductor region is connected to ground. A high potential electrode connected to the resistive diffusion region is also connected to the first semiconductor island region. In this manner, an emitter and a base of a parasitic transistor of the integrated circuit are connected together to prevent the parasitic transistor from operating in a conductive state, thereby preventing latch up.