The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 20, 1995
Filed:
May. 04, 1994
Werner Reczek, Ottobrunn, DE;
Hartmud Terletzki, Ottobrunn, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
An integrated semiconductor circuit includes a semiconductor substrate. At least one first and at least one second potential rail respectively carry first and second supply potentials of the semiconductor circuit during operation. At least one input signal line has at least one input signal terminal and at least one output signal line has at least one output signal terminal and at least one additional line connected to the output signal terminal. At least one first circuit portion receives and processes input signals and at least one second circuit portion develops at least one output signal of the semiconductor circuit during operation of the semiconductor circuit. A configuration for protection against overvoltages has a first protection circuit for each input signal terminal being connected between a respective input signal terminal and a respective first circuit portion, and has a second protection circuit for each output signal terminal being connected to the additional line. Each protection circuit has a field oxide transistor, a field-controlled diode and a diffusion resistor. The potential rails each have a region adjacent at least one of the protection circuits. At least one of the potential rails has a tub-shaped protection structure disposed under the region. The protection structure is disposed in the substrate and is electrically conductively connected to a respective one of the potential rails.