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:
Jul. 25, 2000
Filed:
May. 14, 1999
Donald H St Pierre, Jr., Nashua, NH (US);
Conrad A Theron, San Jose, CA (US);
Xilinx, Inc., San Jose, CA (US);
Abstract
The present invention provides an apparatus for converting logic signals of a first voltage level to logic signals of a second voltage level in response to a control signal indicative of whether logic signals on an associated target device are of the first or second voltage level. An output configuration includes a de-multiplexer having an input terminal coupled to receive an output signal of an associated logic circuit, a control terminal coupled to receive a control signal, and first and second output terminals, the first de-multiplexer output terminal being connected to the target device. A switch coupled between the second de-multiplexer output terminal and the target device has a control terminal coupled to receive the control signal. When the control signal is in a first state, a voltage drop across the switch converts the logic signals of the first voltage level to logic signals of the second voltage level. When the control signal is in a second state, the switch is not conductive, and the logic signals of the associated logic circuit are provided directly to the target device.