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:
Dec. 11, 2007
Filed:
May. 16, 2005
Applicant:
Joseph D. Wert, Arlington, TX (US);
Inventor:
Joseph D. Wert, Arlington, TX (US);
Assignee:
National Semiconductor Corporation, Santa Clara, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03K 10/0185 (2006.01);
U.S. Cl.
CPC ...
Abstract
A level shifter for use in a dual power supply circuit operating from a VDD power supply and a VDDH power supply greater than the VDD power supply. The level shifter indicates to a status circuit in the VDDH power supply domain that the VDD power supply is enabled. The level shifter detects when the VDD power supply is on and sets an enable signal to the status circuit. The level shifter also detects when the VDD power supply is off and clears the enable signal to the status circuit.