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:
Apr. 14, 2009
Filed:
May. 21, 2007
Bunsho Kuramori, Tokyo, JP;
Bunsho Kuramori, Tokyo, JP;
Oki Semiconductor Co., Ltd., Tokyo, JP;
Abstract
A nonvolatile semiconductor memory for suppressing the access delay due to the parasitic capacitance between bit lines is disclosed. Bit lines are selected by a bit select signal, and the data of the memory cell selected in accordance with the level of data lines by a sense amplifier are read, after which the read data are held in a latch circuit. Then, a control signal is set to 'High', thereby to turn on a NMOS and set the data lines to a grounding potential. As a result, the charges of the selected bit lines are discharged. After that, even if adjacent bit lines are selected next for reading, the effect of the parasitic capacitance between the adjacent bit lines is obviated, and the next data can be read without causing any access delay.