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:
Mar. 31, 1998
Filed:
Jul. 03, 1996
Applicant:
Inventor:
Kuniyoshi Yoshikawa, Tokyo, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
36518513 ; 36518522 ; 36518524 ;
Abstract
When the upper limit value of a leakage current allowed by a read.detection/write circuit connected to a plurality of bit lines to read and write data from and in memory cells is represented by IL, Vs satisfies ##EQU1## (ln is the natural logarithm) where Vgh is the potential of a non-selected word line, Vta is the average threshold voltage of the memory cells, e is the standard deviation, s is the subthreshold coefficient, Vd is the potential of the bit lines, and Vs is the potential of a source line.