Semiconductor integrated circuit device with protection against tampering

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United States of America Patent

PATENT NO 8970247
APP PUB NO 20120056639A1
SERIAL NO

13196321

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Importance

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Abstract

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A semiconductor integrated circuit device has a circuit block formed on a semiconductor substrate, and an electrically conductive pattern formed in an upper layer of a portion of the circuit block that is to be protected. An oscillation circuit is connected to the electrically conductive pattern, and is configured to oscillate at an oscillation frequency determined by a circuit constant of the electrically conductive pattern, and a detection circuit is configured to determine whether a preset range includes the oscillation frequency of the oscillation circuit.

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Oomura, Masanobu Yokohama, JP 23 634

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