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. 18, 1996
Filed:
Sep. 30, 1994
Michael J McManus, Fort Collins, CO (US);
Philip W Bullinger, Loveland, CO (US);
Andres R Teene, Fort Collins, CO (US);
Gerald R Haag, Fort Collins, CO (US);
Hoang P Nguyen, Fort Collins, CO (US);
AT&T Global Information Solutions Company, Dayton, OH (US);
Hyundai Electronics America, Milpitas, CA (US);
Symbios Logic Inc., Fort Collins, CO (US);
Abstract
In an electronic IC package, an I/O PAD circuit design which protects 3 Volt optimized I/O functional circuits from damage due to the application of external 5 Volt signals to the I/O PAD both while the functional circuit design is powered on and powered off. When the I/O circuits associated with the I/O PAD are powered on, the present invention protects the I/O circuits by applying well known designs. However, when the I/O circuits associated with the I/O PAD are powered off, the present invention draws power from the external 5 Volt signal to activate additional transistors to protect the powered off I/O circuits.