Input/output protective device
First Claim
1. An input/output protective comprising:
- a protective element which induces an electric discharge between diffusion layers of a second conductive type which are disposed on a semiconductor substrate of a first conductive type and are facing each other; and
a plurality of contacts each of which connects a metal wiring layer with at least one of the diffusion layers, wherein at least one contact of the plurality of contacts, the one contact being disposed at an end section of the protective element, has a higher resistance than others of the plurality of contacts.
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Accused Products
Abstract
The present invention provides an excellent input/output protective device which has a withstand voltage of 200 V or more in device simulation tests according to the EOS/ESD standard. There is presented an input/output device having a protective element that prevents external noise from degrading the internal circuit therein by inducing an electric discharge between diffusion layers of the second conductive type thereof which are disposed on a semiconductor substrate of the first conductive type and facing each other; wherein there are equipped with a plurality of contacts each of which connects a metal wiring layer with a diffusion layer; and a contact at the end section of the protective element on the side of the input section, at least, is provided with a means to increase the resistance thereof so as to make that larger than the resistance of the other contacts.
22 Citations
11 Claims
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1. An input/output protective comprising:
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a protective element which induces an electric discharge between diffusion layers of a second conductive type which are disposed on a semiconductor substrate of a first conductive type and are facing each other; and
a plurality of contacts each of which connects a metal wiring layer with at least one of the diffusion layers, wherein at least one contact of the plurality of contacts, the one contact being disposed at an end section of the protective element, has a higher resistance than others of the plurality of contacts. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An input/output protective device comprising:
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a first diffusion layer connected to an input/output terminal;
a second diffusion layer connected to a ground or supply potential or to a wiring fixed at a predetermined potential, the first diffusion layer and the second diffusion layer are arranged as facing each other on a surface of a semiconductor substrate; and
a plurality of contacts for connecting wiring layers to the first and second diffusion layers, wherein the length of the first diffusion layer is larger at both end sections than the length of the second diffusion layer by at least one contact pitch length. - View Dependent Claims (10, 11)
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Specification