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:
Jan. 17, 1995
Filed:
Oct. 18, 1993
Takahiro Komatsu, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A dynamic random access memory includes an improved redundant use detection circuit, a redundant fuse circuit for programming a defective row, and a redundant enable circuit for enabling the redundant fuse circuit. Redundant use detection circuit includes a switching element responsive to a redundant use signal from the redundant enable circuit for conducting. High voltage is applied through an external terminal in a redundant use detection mode, and use of a redundant circuit is detected by the presence of current flowing into the redundant use detection circuit. Since a fuse element is not necessary in the redundant use detection circuit, integration density is further improved, thus permitting easy detection of use of a redundant circuit as well.