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:
Aug. 12, 1997
Filed:
Aug. 27, 1996
Applicant:
Inventor:
Kenji Hibino, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
36518901 ; 365 51 ; 36518904 ; 36523004 ;
Abstract
In a NOR-type mask ROM, only one of opposite ends of each subsidiary digit line is connected to each block selection MOS transistor. The block selection MOS transistors are alternately connected to one end and the other end of adjacent subsidiary digit lines. Each of the block selection MOS transistors has a source and a drain connected to the primary and the subsidiary digit lines so that a current path at a channel portion has a direction perpendicular to the block selection lines. A gate of each block selection MOS transistor is located directly under the block selection line and has a gate width wider than the width of the subsidiary digit line.