Semiconductor memory device with switching for redundant cells
First Claim
1. In an organization for multi-bit output which comprises a plurality of memory cell groups and a plurality of data buses, each of which belongs to each of said groups, wherein one of memory cells in each memory cell groups are selected at the same time, a semiconductor memory device comprising;
- a plurality of groups of redundant cells one of which can replace a group of memory cells which comprise a defective memory cell;
switching circuits which selectively connect one of said groups of the redundant cells to the data bus belonging to one of said groups of memory cells, so that said switching circuit can connect said one of said groups of said redundant cells to one of said data buses belonging to any of said cell groups; and
wherein said switching circuits comprise a first switch which is connected between data buses corresponding to a first group of redundant cells and a second group of redundant cells, a second switch which is connected between data buses corresponding to a first cell block and said first group of redundant cells and a third switch which is connected between data buses corresponding to a second cell block and said second group of redundant cells.
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Abstract
A organization for multi-bit output includes a plurality of memory cell groups and a plurality of data buses, each of which belongs to each of the groups, wherein one of memory cells in each memory cell groups are selected at the same time. A semiconductor memory device includes a plurality of groups of redundant cells one of which can replace a group of memory cells which comprise a defective memory cell, and switching circuits which selectively connect one of the groups of the redundant cells to the data bus belonging to one of the groups of memory cells. The switching circuit can connect the one of groups of the redundant cells to one of the data buses belonging to any of the cell groups.
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Citations
4 Claims
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1. In an organization for multi-bit output which comprises a plurality of memory cell groups and a plurality of data buses, each of which belongs to each of said groups, wherein one of memory cells in each memory cell groups are selected at the same time, a semiconductor memory device comprising;
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a plurality of groups of redundant cells one of which can replace a group of memory cells which comprise a defective memory cell; switching circuits which selectively connect one of said groups of the redundant cells to the data bus belonging to one of said groups of memory cells, so that said switching circuit can connect said one of said groups of said redundant cells to one of said data buses belonging to any of said cell groups; and wherein said switching circuits comprise a first switch which is connected between data buses corresponding to a first group of redundant cells and a second group of redundant cells, a second switch which is connected between data buses corresponding to a first cell block and said first group of redundant cells and a third switch which is connected between data buses corresponding to a second cell block and said second group of redundant cells. - View Dependent Claims (2, 3, 4)
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Specification