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:
Jun. 21, 2005
Filed:
Feb. 26, 2001
Shinya Fujioka, Kawasaki, JP;
Hitoshi Ikeda, Kawasaki, JP;
Masato Matsumiya, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
The present invention provides a semiconductor memory device of a twin-storage type having an operation control method and a circuit structure that achieve a higher process rate, a less power consumption, and a smaller chip area. This semiconductor memory device includes bit lines in pairs, a sense amplifier connected to each pair of the bit lines, a first memory cell connected to one bit line of each pair of the bit lines, a second memory cell that is connected to the other bit line of each pair of the bit lines and stores the inverted data of the data stored in the first memory cell. This semiconductor memory device is characterized by not having means to pre-charge the bit lines to a predetermined potential. The semiconductor memory device of the present invention is also characterized by including a control circuit that controls the sense amplifier to start a pull-down operation after starting a pull-up operation.