US Patent 7570536 Column redundancy circuit

A column redundancy circuit is disclosed. The column redundancy circuit includes a first control signal generator configured to receive a refresh flag signal having an enable width larger than that of a refresh signal and a control signal and generate a pull-up control signal, a second control signal generator configured to receive the refresh flag signal and an address signal and generate a pull-down control signal, and a column repair fuse circuit configured to receive the pull-up control signal and the pull-down control signal and generate a redundant cell access signal.