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. 07, 2003
Filed:
Nov. 30, 2001
Gubo Huang, Milpitas, CA (US);
Hy V. Nguyen, San Jose, CA (US);
Shankar Lakkapragada, San Jose, CA (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
A low-voltage output circuit configurably providing a bus-hold function and a weak pull-up function, while having only transitory leakage current through the circuit regardless of the voltage level on the pad. Thus, the output circuit can be used in low-voltage devices that interface with higher-voltage devices without paying the penalty of increased leakage current. One embodiment of the invention includes a circuit output node coupled to a configurable weak pull-up circuit, a configurable bus hold circuit, and a configurable leakage prevention circuit. The configurable circuits are controlled by configuration signals that determine which circuits are active. One embodiment is implemented as a portion of a programmable logic device (PLD), and the configuration signals are programmed into configuration memory cells as part of the configuration of the PLD.