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:
Aug. 10, 1999
Filed:
Sep. 17, 1997
Applicant:
Inventor:
Naoaki Naka, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03K / ;
U.S. Cl.
CPC ...
327437 ; 327112 ;
Abstract
A power-supply circuit 121 generates a potential Vw which is approximately the higher of a power-supply potential VDD and a potential Vo at an output to set the potential Vw at an N-well of a pMOS pull-up transistor Qu equal to or higher than the potential at the source S and the drain D of the pMOS transistor Qu. The power-supply circuit 122 generates a potential Vs approximately equal to VDD--Vth when Vo<VDD, and turns off when Vo>VDD to prevent a current from flowing from the output OUT through the pMOS transistor Qu to the power-supply potential VDD, where Vth is the threshold voltage of the MOS transistors.