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. 04, 1998
Filed:
Oct. 11, 1996
Applicant:
Inventors:
Teiichiro Nishizaka, Tokyo, JP;
Kazuyuki Yamasaki, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365104 ; 365 94 ; 365 72 ; 36523003 ; 365 63 ;
Abstract
When a data bit is read out from a semiconductor read only memory device, a current-mirror type sense amplifier is electrically connected through a bit line, a first selector, a selected memory cell and a second selector to a discharging line so as to check a potential drop on the bit line, and each of the first and second selectors selectively connects the bit line or the discharging line to eight columns of memory cells by increasing the component switching transistors thereof so as to space the bit line from the discharging line, thereby increasing a margin for a bit line contact.