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:
Feb. 27, 2001
Filed:
May. 25, 2000
Tonomi Egawa, Kanagawa, JP;
NEC Corporation, Tokyo, JP;
Abstract
A semiconductor memory device in accordance with this invention having multi-valued memory cell that stores a plurality of bits has a recognition apparatus judging whether an input address signal designates upper data or designates lower data among a plurality of bits, a row selecting apparatus selecting word lines corresponding with the input address signal and applying to selected word lines only word line voltages necessary for reading out upper data or lower data among a plurality levels of word line voltages corresponding with results of the recognition apparatus, a column selecting apparatus selecting bit lines in accordance with the input address signal, and an output apparatus generating output data in accordance with levels of the selected bit lines.