Input protection device for integrated circuits

Details Input protection device for integrated circuits Input protection device for integrated circuits

1980-04-28

1982-07-27

Larkins, William D.

357 13, 357 20, 357 23, 357 51, 357 68, H01L 2704

Patent

active

043420451

ABSTRACT:
A new input protection device for integrated circuits in which the metal-semiconductor contact between a metal line from a metal input pad and doped semiconductor region in the substrate leading to the rest of the integrated circuit is significantly rounded. This reduces the tendency of high current densities to flow through specific areas of the contact creating a short-circuiting metal-semiconductor spike into the substrate. Furthermore, the contact is enlarged beyond the normal size of contacts within the integrated circuit and the conducting region below is formed deeper and laterally away from the contact for further protection.

REFERENCES:
patent: 3629782 (1971-12-01), Sahni
patent: 3648129 (1972-03-01), Nienhuis
patent: 3673427 (1972-06-01), McCoy et al.
patent: 3673428 (1972-06-01), Athanas
patent: 3712995 (1973-01-01), Steudel
patent: 3754171 (1973-08-01), Anzai et al.
patent: 3967295 (1976-06-01), Stewart
patent: 4173022 (1979-10-01), Dingwall
Cohen et al., "Single-Transistor Cell . . . ", Electronics, Aug. 2, 1971, pp. 69-75 and front cover of issue.

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