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:
Jan. 10, 2006
Filed:
Apr. 13, 2004
Shi-dong Zhou, Milpitas, CA (US);
Ping Zhang, Sunnyvale, CA (US);
Ronald L. Cline, Albuquerque, NM (US);
Shi-dong Zhou, Milpitas, CA (US);
Ping Zhang, Sunnyvale, CA (US);
Ronald L. Cline, Albuquerque, NM (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
A selectively enabled clamp circuit for limiting voltage overshoot on an input/output (I/O) pin of an associated integrated circuit (IC) device includes a single discharge transistor and a select circuit. The single discharge transistor is connected between the I/O pin and ground potential, and the select circuit is coupled to the I/O pin and includes an input to receive an enable signal and an output coupled to a gate of the signal discharge transistor. For some embodiments, the select circuit includes a level shifter circuit and a voltage detection circuit.