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:
Oct. 26, 2010
Filed:
Sep. 26, 2008
Shinobu Asayama, Kanagawa, JP;
Shinobu Asayama, Kanagawa, JP;
NEC Electronics Corporation, Kanagawa, JP;
Abstract
In a semiconductor storage device including a transistor for reading port, undesired voltage decrease may occur in a bit line in a reading operation due to a leak current from the transistor for reading port of a memory cell, which may cause a reading error. A semiconductor storage device according to one aspect of the present invention includes a third transistor having one of a source and a drain connected to a first bit line and switching supply of a ground voltage performed on the first bit line in accordance with a value held in a memory cell according to selection and non-selection of the memory cell, and a fixed voltage keeping circuit keeping a potential of the other of the source and the drain of the third transistor to a fixed potential in a memory cell non-selected state in a six-transistor SRAM.