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. 07, 2004
Filed:
Dec. 27, 2002
Koichi Morikawa, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A semiconductor storage device in the invention comprises a first control transistor which is connected between a bit line and a first node and whose control terminal is connected to a word line, a data retention circuit which includes a first transistor that is connected between the first node and a second reference voltage terminal, as well as a first inverter that includes a second transistor connected between a second node and the second reference voltage terminal, and a substrate potential control circuit which selectively alters a substrate potential of the first transistor so as to make a threshold voltage of the first transistor higher as compared with threshold voltages of the first control transistor and the second transistor. Thus, it is permitted to provide the semiconductor storage device of static type which realizes a reduced layout area and a lower-dissipation-power operation while ensuring the reliability and high operating speed of the write and read of data.