Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1998-09-23
2000-11-14
Jackson, Stephen W.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361 56, 361 58, 361 911, H02H 900
Patent
active
061478520
ABSTRACT:
An electrostatic discharge protection circuit for integration into an integrated circuit device. The protection circuit includes at least one transistor having a first terminal connected to an input or output terminal of the integrated circuit device, a second terminal connected to a supply line for the integrated circuit device, and a control terminal connected to ground. In a preferred embodiment, the transistor is formed by a structure that includes a substrate of a first conductivity type, a first region of a second conductivity type, a second region of the first conductivity type, a third region of the first conductivity type, and a fourth region of the second conductivity type. The third region has greater conductivity than the substrate and the fourth region has greater conductivity than the first region. These regions are formed such that the first region extends from a surface of the substrate, the second region extends from the surface into a portion of the first region, and the third region has one portion buried beneath the first region and another portion extending to the surface. Additionally, the fourth region extends from the second region with a ring shape so as to form a bipolar junction with the second region in an area beneath a non-peripheral portion of the second region.
REFERENCES:
patent: 5086365 (1992-02-01), Lien
patent: 5539327 (1996-07-01), Shigehara et al.
European Patent Abstract of Japanese publication No. 59123256, published Jul. 17, 1984.
European Search Report dated Feb. 18, 1998 with annex on European Application No. 97 830463.
Bongini Stephen C.
Galanthay Theodore E.
Jackson Stephen W.
STMicroelectronics S.r.l.
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