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US 5,636,172 AGranted
Reduced pitch laser redundancy fuse bank structure
AssigneeMicron Technology, Inc.
InventorsKirk Prall, Tod S. Stone, Paul S. Zagar
Life of this patent
Estimating the term…
Abstract
A configuration for a laser fuse bank is disclosed wherein the available space is more efficiently used. Fuses of graduated width and variable configuration are placed so as to minimize the average distance between fuses and maximize fuse density. Alternatively, a common source is added to a standard laser fuse structure such that it intersects the fuses and the number of available fuses is doubled.
Claims6
An integrated circuit memory comprising:
- an array of primary memory cells arranged in rows and columns;
- a plurality of redundant memory cells;
- and
- a plurality of laser fuse banks, each laser fuse bank comprising:
- a center fuse having a narrow end, a wide end, and a common centerline;
- a first outer fuse having a narrow end and a wide end, located adjacent to the center fuse such that the narrow end of the first outer fuse is adjacent to the narrow end of the center fuse and the wide end of the first outer fuse is adjacent to the wide end of the center fuse, the wide end of the first outer fuse is laterally offset from the narrow end of the first outer fuse;
- and
- a second outer fuse having a narrow end and a wide end, located adjacent to the center fuse and on the side of the center fuse opposite the first outer fuse such that the narrow end of the second outer fuse is adjacent to the narrow end of the center fuse and the wide end of the second outer fuse is adjacent to the wide end of the center fuse, and the wide end of the second outer fuse is laterally offset from the narrow end of the second outer fuse.
5 more elements
Dependencies are inferred from the claim text.