| 摘要 |
An identification circuit for identifying how many redundant rows and columns have been substituted for normal rows and columns in a memory device is disclosed. Column and row identifying circuits are used, respectively, with each circuit having a plurality of fuses with each fuse having a pair of leads and a plurality of resistive elements with each resistive element connected, in series, to a lead of one of the fuses and with the remaining lead of the fuse connected to a common lead. Each resistive element is connected to a ground to permit each interconnected fuse and resistive element to be connected in parallel. Thus, in use, each fuse intentionally opened in assembly of the memory device indicates that a malfunctioning single normal row/column has been substituted with a redundant row/column and upon sealing the memory device, substitution is indicated by application of a voltage to each circuit to form a current therein which is related to a number of substituted rows/columns present in the memory device.
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