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:
Feb. 14, 1984
Filed:
Mar. 31, 1981
Applicant:
Inventors:
Katsuyuki Yamada, Kawasaki, JP;
Hideaki Isogai, Higashikurume, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365190 ; 365226 ;
Abstract
This invention relates to a bipolar static type semiconductor memory device which reduces the influence of disturbances on the memory cells of non-selected chips and thereby obtains a large memory holding margin for the memory cells. The semiconductor memory device of the present invention comprises flip-flop type circuit memory cells at the intersecting points of word lines and bit lines. The memory holding margin of the memory cells is increased by clamping the bit line voltage of the non-selected cells to a voltage higher than the bit line voltage of a selected chip being read.