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:
Sep. 28, 2010
Filed:
Oct. 12, 2007
Che Yuan Jao, Hsinchu, TW;
Yuan-chin Liu, Hsinchu, TW;
Che Yuan Jao, Hsinchu, TW;
Yuan-Chin Liu, Hsinchu, TW;
Mediatek Inc., Hsin-Chu, TW;
Abstract
Level shifters capable of setting logic level of the output signals thereof to a pre-defined known state during power-up are provided, in which a first logic unit is powered by a first power voltage, receives input signals with a core power voltage and comprises first and second output terminals. First and second drivers are coupled between the first output terminal and the first power voltage and between the second output terminal and the second power voltage respectively. When one of the first and second power voltages is not ready during power-up, the first driver matches a voltage level on the first output terminal with the first power voltage by AC coupling and the second driver pulls low or maintains a voltage level on the second output terminal.