Patent US5214562A successfully refreshed from Google Patents.
US5214562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic discharge protective circuit of shunting transistors
Assignee: United States Department of the Air Force
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Filing: 1991-06-14
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Granted: 1993-05-25
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Expires: 2011-06-14
Abstract
Abstract An electrostatic discharge protective apparatus for an integrated circuit having normally on semiconductor devices mutually connecting input/output pads and the power in bonding pad to prevent stray electrostatic discharges from damaging the integrated circuit components when the integrated circuit is not powered on. All adjacent input/output pads are connected to each other by a normally on transistor. Each pad is additionally connected to a power supply pad by a normally on transistor.
Inventors
- 👤 Mark W. Levi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:05
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H02H9/045; H02H9/046
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
An electrostatic discharge protective apparatus for an electronic circuit on an integrated circuit substrate comprising in combination: a plurality of input/output pads arranged in proximity to one another, a conductor arranged in proximity to each input/output pad of said plurality of input/output pads and electrically connected to a further bonding pad, a first plurality of semiconductor devices operatively connected respectively between adjacent input/output pads of said plurality of input/output pads and said bonding pad, each semiconductor device of said first plurality of semiconductor devices is normally on, a second plurality of semiconductor devices operatively connected respectively to each input/output pad of said plurality of input/output pads and to said conductor, and, each semiconductor device of said second plurality of semiconductor devices is normally on, and means for generating delayed bias and delivering said bias to the controlling terminals of said first and second plurality of semiconductor devices, upon receipt of power to said electronic circuit; said delayed bias means turns off said first and second pluralities of semiconductor devices.
Claim 2
Dependent Claim
169 words
An electrostatic discharge protective apparatus for an electronic circuit on an integrated circuit substrate comprising in combination: a plurality of input/output pads arranged in proximity to one another, a conductor arranged in proximity to each input/output pad of said plurality of input/output pads and electrically connected to a further bonding pad, a first plurality of semiconductor devices operatively connected respectively between adjacent input/output pads of said plurality of input/output pads and said bonding pad, each semiconductor device of said first plurality of semiconductor devices is normally on, a second plurality of semiconductor devices operatively connected respectively to each input/output pad of said plurality of input/output pads and to said conductor, and, each semiconductor device of said second plurality of semiconductor devices is normally on, and means for generating delayed bias and delivering said bias to the controlling terminals of said first and second plurality of semiconductor devices, upon receipt of power to said electronic circuit; said delayed bias means turns off said first and second pluralities of semiconductor devices.
Claim 3
Dependent Claim
23 words
An electrostatic discharge protective apparatus as described in claim 1 wherein said delayed bias is removed upon losing power to said electronic circuit.
Claim 4
Dependent Claim
24 words
According to claim 2 wherein the semiconductor devices of said first and second pluralities comprise a selection of depletion mode transistors and/or normally-on junction-transistors.
Claim 5
Dependent Claim
24 words
According to claim 1 wherein the semiconductor devices of said first and second pluralities comprise a selection of depletion mode transistors and/or normally-on junction-transistors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |