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:
May. 15, 2007
Filed:
May. 04, 2005
Applicant:
Hiroyuki Yamauchi, Osaka, JP;
Inventor:
Hiroyuki Yamauchi, Osaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 17/00 (2006.01); G11C 5/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
A mask ROM includes bit lines, word lines intersecting with the bit lines and bit cells provided along the word lines, each of the bit lines being formed of a cell transistor having a gate connected to an associated one of the word lines. In the mask ROM, further provided is a source node commonly connected to respective sources of ones of the cell transistors having a gate connected to one of adjacent two word lines. A current flows from a selected bit line to a non-selected bit line via a cell transistor selected in reading out data and the source node.