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:
Jan. 07, 1992
Filed:
Oct. 18, 1990
Applicant:
Inventors:
Shuji Ikeda, Tokyo, JP;
Satoshi Meguro, Tokyo, JP;
Makoto Motoyoshi, Tokyo, JP;
Osamu Minato, Tokyo, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 41 ; 357 234 ; 357 236 ; 357 238 ; 357 2312 ; 357 51 ; 357 59 ;
Abstract
Herein disclosed is a semiconductor integrated circuit device having a SRAM, in which two MISFETs of a flip-flop circuit of a memory cell are connected directly with an n.sup.+ -type drain region so that they are cross coupled; and in which a p.sup.+ -type semiconductor region is formed below a direct contact part by making use of the mask used in the step of forming contact holes for the direct contact part. The p.sup.+ -type semiconductor region aids as a barrier to prevent soft errors of the SRAM due to .alpha.-particles.