| 摘要 |
A row redundancy circuit comprises a fuse box group array, a redundant row predecoder and a redundant sub-row decoder. The fuse box group array which comprises a plurality of fuse box groups detects whether repaired row addresses are applied. Each fuse box group consists of at least two or more fuse boxes to detect row addresses. The redundant row predecoder performs a logic operation on an output signal from each fuse box group to selectively activate redundant main wordlines each of which correspondings to a plurality of redundant sub-wordlines. The redundant sub-row decoder performs a logic operation on output signals from the fuse box groups, which are classified into group signals corresponding to the number of fuse boxes in each fuse box group, to output a boosting signal for selectively activating the plurality of sub-wordlines corresponding to the each redundant main wordline. In the row redundancy circuit, the space for redundant main wordlines can be effectively utilized because 8 redundant sub-wordlines are controlled by one redundant main wordline.
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