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Integrated circuit with improved protective device

  • US 4,819,046 A
  • Filed: 05/22/1987
  • Issued: 04/04/1989
  • Est. Priority Date: 05/22/1986
  • Status: Expired due to Fees
First Claim
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1. A protective device for a functional circuit fabricated on a major surface of a semiconductor substrate of a first conductivity type, comprising first and second regions of a second conductivity type spaced apart from each other and formed at said major surface of said semiconductor substrate, each of said first and second regions having at least a first side and a second side opposite to said first side, the first side of said first region and the first side of said second region facing to each other substantially in parallel and being spaced apart via an isolating area, an insulating layer overlying said major surface of said semiconductor substrate to cover at least said first and second regions, a conductive layer formed on said insulating layer near the second side of said first region, said conductive layer being supplied with an external signal and electrically connected to said first region, a third region of said second conductivity type formed at said major surface of said semiconductor substrate and having at least first and second opposite ends, said third region being connected at its first end to a central part of said second side of said first region and extending therefrom through a region underlying said conductive layer, a wiring layer electrically connected to said second region and supplied with a reference potential, and means for connecting the second end to said third region of said functional circuit.

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