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. 03, 2008
Filed:
Aug. 30, 2005
Dipankar Bhattacharya, Macungie, PA (US);
Makeshwar Kothandaraman, Whitehall, PA (US);
John C. Kriz, Palmerton, PA (US);
Bernard L. Morris, Emmaus, PA (US);
Yehuda Smooha, Allentown, PA (US);
Dipankar Bhattacharya, Macungie, PA (US);
Makeshwar Kothandaraman, Whitehall, PA (US);
John C. Kriz, Palmerton, PA (US);
Bernard L. Morris, Emmaus, PA (US);
Yehuda Smooha, Allentown, PA (US);
Agere Systems Inc., Allentown, PA (US);
Abstract
A buffer circuit operative at multiple power supply voltage levels includes first and second buffers, the first buffer being configured for operation with a first voltage source and the second buffer being operative with a second voltage source. The buffer circuit further includes a controllable isolation circuit. An output of the first buffer connects to an external pad of the buffer circuit, and an output of the second buffer connects to the pad via the isolation circuit. The buffer circuit is selectively operative in at least a first mode or a second mode in response to at least a first control signal. The isolation circuit is operative in the first mode to substantially isolate the second buffer from the external pad and is operative in the second mode to connect the output of the second buffer to the external pad.