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. 25, 2007
Filed:
Mar. 31, 2003
Mutsuo Nishikawa, Nagano, JP;
Katsumichi Ueyanagi, Nagano, JP;
Katsuyuki Uematsu, Nagano, JP;
Akio Kitamura, Nagano, JP;
Mutsuo Nishikawa, Nagano, JP;
Katsumichi Ueyanagi, Nagano, JP;
Katsuyuki Uematsu, Nagano, JP;
Akio Kitamura, Nagano, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
An over-voltage protection circuit for protecting an integrated circuit includes an external power supply terminal to which a power supply voltage is supplied, a grounding terminal to which a ground voltage is supplied, and an internal power supply terminal for supplying the power supply voltage to the integrated circuit. A voltage dividing unit is connected between the external power supply terminal and the grounding terminal for dividing a voltage supplied from the external power supply terminal, and has a Zener diode and a first resistor connected in series. A signal generating unit is connected between the external power supply terminal and the grounding terminal for outputting the power supply voltage or the ground voltage, and a switching unit is connected between the internal power supply terminal and the signal generating unit for performing a switching operation.