Protection circuit for semiconductor integrated circuit and driving method therefor

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United States of America Patent

PATENT NO 8934204
SERIAL NO

13408533

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Abstract

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A surge protection circuit comprises a surge detection circuit 14 for detecting a surge applied to a semiconductor integrated circuit, and a protection element 15 for absorbing the surge. The protection element is connected between a signal terminal for supplying a signal to the semiconductor integrated circuit and a power source terminal for supplying a power source voltage. When the power source voltage is not larger than a voltage enough to normally operate the semiconductor integrated circuit and the surge detection circuit does not detect the surge, the protection element is set in a current limiting state. When the power source voltage is not larger than a voltage enough to normally operate the semiconductor integrated circuit and the surge detection circuit detects the surge, the protection element is set in a current non-limiting state.

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nakamura, Hiroyuki Atsugi, JP 526 4354

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