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:
Dec. 02, 2008
Filed:
Oct. 27, 2006
Toshio Sunaga, Ohtsu, JP;
Toshio Sunaga, Ohtsu, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
The objective of the present invention is to provide a DRAM that reduces the current consumed by an address comparison circuit that compares an address signal with a defective address signal that has been programmed. Redundant predecoders predecode a defective row address signal DRA output by program circuits, and an address comparison circuit compares a predecoded signal, output by a predecoder, with the defective predecoded signals PDRA, output by the redundant predecoders. In the case of a 2-bit predecoding system, the address comparison circuit compares the predecoded signal PRA with the defective predecoded signal PDRA using four bits in order to compare the row address signal RA with the defective row address signal DRA using groups of two bits.