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:
Nov. 05, 2002
Filed:
Nov. 14, 2001
Applicant:
Inventor:
Yoshinori Inoue, Hyogo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11C 7/00 ;
U.S. Cl.
CPC ...
G11C 7/00 ;
Abstract
A semiconductor memory device has pads, a source voltage supplying circuit, and a memory cell array. The source voltage supplying circuit includes an output node, a switching circuit, and a node. In a normal operation mode, the switching circuit is turned off, and the source voltage supplying circuit supplies a ground voltage supplied from the pad directly to the memory cell array. In a test mode, the switching circuit is turned on, and the source voltage supplying circuit supplies the ground voltage applied from the pad to the memory cell array via an impedance. As a result, a memory cell having little margin can be easily detected.