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:
Apr. 10, 2001
Filed:
Jul. 14, 1999
David P. Morrill, Scarborough, ME (US);
Fairchild Semiconductor Corporation, South Portland, ME (US);
Abstract
A power-on reset circuit for a dual-supply system. The reset circuit includes a voltage divider powered by the first power supply and a sub-circuit supplied by the second power supply. The output of the voltage divider is connected to a control node of the first reset sub-circuit that is otherwise powered by the second power supply. A second reset sub-circuit is strictly regulated and powered by the second power supply. The first reset sub-circuit provides for translation of a signal having a potential limited by the potential of the first supply into a signal having a potential associated with that of the second supply. Only when a control signal from the voltage divider reaches a certain potential, and the second power supply reaches a certain potential, is the first reset sub-circuit activated in a manner that results in a circuit output signaling both supplies are at a suitable potential. This is useful for hot insertion applications in dual-supply systems.