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. 16, 2002
Filed:
Jun. 09, 2000
Hiroyuki Konishi, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In the level shift circuit, the input unit is connected to the first power source and the ground, and the output unit is connected to the second power source and the ground. The input unit receives a signal changing between the ground potential and the power supply potential of the first power source and outputs the signal. The output unit receives this signal from the input unit, and voltage-shifts it into a signal changing between the ground potential and the power supply potential of the second power source. The output unit includes an interruption circuit which cuts off the current path from the second power source to the ground via the output unit. The output unit also includes a potential detection circuit which detects the time when the first power source is interrupted, and outputs a control signal. When the first power source is interrupted, the control signal of the potential detection circuit causes the interruption circuit to cut off the current path. As a result, it is secured to prevent the through current from flowing to the output unit in the power down mode.