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:
Jul. 18, 2006
Filed:
Mar. 30, 2004
Applicants:
Yasumasa Tsukamoto, Hyogo, JP;
Koji Nii, Hyogo, JP;
Inventors:
Yasumasa Tsukamoto, Hyogo, JP;
Koji Nii, Hyogo, JP;
Assignee:
Renesas Technology Corp., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C 11/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A substrate potential setting circuits are provided which control substrate potentials in units of columns of a memory cell array at least in data writing. Upon data writing, the potential of the substrate region of memory cell transistors on a selected column is changed to reduce the data holding characteristics (static noise margin) to ensure high-speed data writing to the memory cells. Data writing is performed at high speed without impairing stability of data retention.