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:
Dec. 26, 1989
Filed:
Jul. 07, 1988
Shuji Ikeda, Koganei, JP;
Kouichi Nagasawa, Kunitachi, JP;
Satoshi Meguro, Tokyo, JP;
Sho Yamamoto, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A static RAM exhibiting a high reliability and suited to a higher density of integration is disclosed. In each memory cell of this static RAM, the cross coupling of a flip-flop circuit is made by gate electrodes of MISFETs constituting this flip-flop circuit. In addition, a source line is formed by the same step as that of a word line. A resistance value of a polycrystalline silicon layer which is a load resistor is changed in accordance with information to be stored. Furthermore, semiconductor regions for preventing soft errors attributed to alpha particles etc. are formed under the MISFETs constituting the flip-flop circuit, so that the channels are not adversely affected.