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:
May. 25, 2010
Filed:
Nov. 12, 2008
Sing-keng Tan, San Jose, CA (US);
Sing-Keng Tan, San Jose, CA (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
An integrated circuit has a differential I/O buffer () capable of being operated in a single-ended mode. The I/O buffer includes circuitry (or) for reducing leakage current between the differential I/O pins (P, N) when an undershoot event occurs on a pin when operated single-ended mode. In one case, a differential termination circuit () includes a differential termination isolation circuit () that isolates the termination load () and termination load switch () from the single-ended pin. Alternatively or additionally, a differential output driver () of the I/O buffer switches a common bias voltage (ncom) to a supply voltage (V) in single-ended mode to insure the transistors (A, B) in the driver legs remain OFF during an undershoot event.