Redundancy circuit and semiconductor device using the same

摘要

A redundancy control circuit includes a redundancy decoder and a decoder killer circuit. The redundancy decoder includes a plurality of fuse circuits corresponding to a plurality of determination signals which are previously activated, and each of the plurality of fuse circuits contains a plurality of fuse sections each containing a fuse. The decoder killer circuit generates a killer signal when at least one of the plurality of determination signals is active, and the killer signal is outputted to an external unit in a first check mode. One of the plurality of fuse circuits is selected and determination signals corresponding to non-selected fuse circuits are inactivated. A specific fuse section of the selected fuse circuit inactivates the determination signal to provide indication of whether the fuse section is cut.