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Input protective circuit having a diffusion resistance layer

  • US 5,932,917 A
  • Filed: 04/10/1997
  • Issued: 08/03/1999
  • Est. Priority Date: 04/19/1996
  • Status: Expired due to Term
First Claim
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1. An input protective circuit having a resistance element with one end connected to an input terminal of a semiconductor integrated circuit and the other end connected to an internal circuit, and a field effect transistor consisting of a source and drain for forming a channel between the other end of said resistance element and a reference voltage conductor and a gate covering said channel, comprising:

  • a first diffusion layer region including a first impurity diffusion layer corresponding to said drain of said field effect transistor and a first diffusion resistance layer corresponding to said resistance element adjacent said first impurity diffusion layer;

    a second diffusion layer region including a second impurity diffusion layer corresponding to said source of said field effect transistor and a second diffusion resistance layer adjacent said second impurity diffusion layer, anda conductor for connecting an end portion of said second diffusion resistance layer to said gate.

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