INTEGRATED CIRCUIT MEMORY DEVICE, SEMICONDUCTOR MEMORY, AND ITS OPERATION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a semiconductor memory having a colume redundant scheme in which repair efficiency and versatility are largely improved and an operation method. SOLUTION: This device is provided with a plurality of input output blocks divided into first and second blocks comprising many memory cells, column selecting lines for normal operation, and spare column selecting lines for repair, only a defective memory cell out of a plurality of memory cells connected to at least one defective column selecting line of the prescribed input output block is replaced by a spare memory cell connected to the prescribed spare column selecting line with a bit unit. The defective column selecting line and the prescribed spare column selecting line are activated simultaneously. As a defective memory cell is replaced by a spare memory cell with a bit unit, repair efficiency and versatility can be improved largely.