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:
Dec. 01, 2009
Filed:
May. 05, 2008
Hiroki Shimano, Tokyo, JP;
Kazutami Arimoto, Tokyo, JP;
Hiroki Shimano, Tokyo, JP;
Kazutami Arimoto, Tokyo, JP;
Renesas Technology Corp., Tokyo, JP;
Abstract
During a stand-by state in which power supply is cut off, a high-voltage power supply control circuit isolates a global negative voltage line transmitting a negative voltage and a local negative voltage line provided corresponding to each respective sub array block from each other and isolates a global ground line and a local ground line transmitting a ground voltage from each other. These local ground line and local negative voltage line are charged to a high voltage level through a high voltage line before cut-off from the corresponding power supply. A leakage current path from a word line to the negative voltage line or the ground line is cut off, so that the word line in a non-selected state can reliably be maintained at a non-selection voltage. Thus, in a low power consumption stand-by mode, data stored in a memory cell can be held in a stable manner.