| 摘要 |
An electrostatic protection circuit to prevent damage to a protected circuit due to electrostatic discharge applied to an input/output terminal, comprises one or more diodes connected in series and provided between a connection point of the input/output terminal and the protected circuit, and a GND terminal and a MOS transistor connected to the diodes in series, and having an operating voltage lower than a signal voltage input from the input/output terminal. The diodes cause a voltage drop in normal operation.
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