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:
Jul. 25, 2000
Filed:
Jun. 03, 1999
Applicant:
Inventors:
Assignee:
NEC Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11C / ;
U.S. Cl.
CPC ...
365201 ; 365200 ;
Abstract
In a roll call tester, a redundancy circuit is provided which, upon predetermined normal cell addressing, activates the normal cell while rendering the redundancy cell nonactive, and, upon predetermined redundancy cell addressing, renders the normal cell nonactive while, when the roll call test signal in the test signal activation circuit is nonactive, activating the redundancy cell. This construction can realize a roll call test while eliminating the need to use a redundancy detection circuit and a signal involved in the detection thereof, and can reduce chip area.