Patent US5747869A successfully refreshed from Google Patents.
US5747869A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduced pitch laser redundancy fuse bank structure
Assignee: Micron Technology Inc
•
Filing: 1997-04-01
•
Granted: 1998-05-05
•
Expires: 2017-04-01
Abstract
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.
Inventors
- 👤 Kirk Prall
- 👤 Tod S. Stone
- 👤 Paul S. Zagar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:08
CPC Classifications
G; G11; G11C; G11C29/00; G11C29/70; G11C29/78; G11C29/785; G11C29/80; H; H10; H10W; H10W20/00; H10W20/40; H10W20/49; H10W20/493; H10W20/494
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
201 words
An integrated circuit laser fuse system comprising: 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.
Claim 2
Dependent Claim
201 words
An integrated circuit laser fuse system comprising: 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.
Claim 3
Dependent Claim
63 words
The integrated circuit laser fuse system of claim 1 wherein the plurality of laser fuse banks comprise: a first laser fuse bank; and a second laser fuse bank positioned such that the second laser fuse bank is adjacent to the first laser fuse bank, and the second laser fuse bank is rotated one hundred eighty (180) degrees from the first laser fuse bank.
Claim 4
Dependent Claim
34 words
The integrated circuit laser fuse system of claim 1 wherein the wide end of the first outer fuse is laterally offset from its narrow end in an outwardly direction away from the center fuse.
Claim 5
Dependent Claim
34 words
The integrated circuit laser fuse system of claim 1 wherein the wide end of the second outer fuse is laterally offset from its narrow end in an outwardly direction away from the center fuse.
Claim 6
Dependent Claim
23 words
The integrated circuit laser fuse system of claim 1 wherein the plurality of laser fuse banks are polysilicon fabricated on an integrated circuit.
Claim 7
Dependent Claim
41 words
The integrated circuit laser fuse system of claim 1 wherein the plurality of laser fuse banks are fabricated in a dynamic random access memory (DRAM), the DRAM comprising: a plurality of primary memory cells; and a plurality of redundant memory cells.
Claim 8
Dependent Claim
51 words
The integrated circuit laser fuse system of claim 6 wherein the DRAM further includes a redundant enable circuit comprising: a latch circuit coupled to one of the fuses of the plurality of laser fuse banks; and a comparator circuit connected to the latch circuit and a plurality of external address inputs.
Claim 9
Dependent Claim
55 words
An integrated circuit laser fuse system comprising: a plurality of substantially straight laser fuses, each one of the plurality of substantially straight laser fuses being located adjacent to and parallel with remaining ones of the plurality of substantially straight laser fuses; and a common ground connection interconnecting the midpoints of the plurality of laser fuses.
Claim 10
Dependent Claim
55 words
An integrated circuit laser fuse system comprising: a plurality of substantially straight laser fuses, each one of the plurality of substantially straight laser fuses being located adjacent to and parallel with remaining ones of the plurality of substantially straight laser fuses; and a common ground connection interconnecting the midpoints of the plurality of laser fuses.
Claim 11
Dependent Claim
22 words
The integrated circuit laser fuse system of claim 8 wherein the plurality of laser fuses are polysilicon fabricated on an integrated circuit.
Claim 12
Dependent Claim
40 words
The integrated circuit laser fuse system of claim 8 wherein the plurality of laser fuses are fabricated in a dynamic random access memory (DRAM), the DRAM comprising: a plurality of primary memory cells; and a plurality of redundant memory cells.
Claim 13
Dependent Claim
50 words
The integrated circuit laser fuse system of claim 10 wherein the DRAM further includes a redundant enable circuit comprising: a latch circuit coupled to one end of one of the plurality of laser fuses; and a comparator circuit connected to the latch circuit and a plurality of external address inputs.
References Cited (Backward Citations)
JPS59151454A
Cited
JPS61128544A
Cited
US5200652A
Cited
JPH05251563A
Cited
US5281868A
Cited
US5264725A
Cited
JPH06310603A
Cited
US5424672A
Cited
EP0720229A2
Cited
US5636172A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-04 | 2001-11-03 | 2002-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-04 | 2005-11-03 | 2006-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-04 | 2009-11-03 | 2010-05-05 | $7700.00 | Window Closed / Lapsed |