ROW REDUNDANCY CIRCUIT AND REPAIR METHOD, ESPECIALLY REDUCING THE NUMBER OF WORD LINES

摘要

PURPOSE: A row redundancy circuit and a repair method are provided to reduce the number of word lines by matching a number of redundant sub word lines to one redundant main word line. CONSTITUTION: According to the row redundancy circuit of a semiconductor memory comprising a redundant main word line and a redundant sub word line, a fuse box group array(100) detects whether a row address for redundancy is applied by comprising fuse box groups comprising at least two fuse boxes. A redundant row decoder(200) enables one redundant main word line selectively corresponding to a plurality of redundant sub word lines. And a redundant sub row decoder(300) generates a boosting signal to drive redundant sub word lines per group selectively.