| 摘要 |
A semiconductor device has an electrostatic protection diode in a signal input portion thereof and is accompanied by a parasitic transistor between the diode and an output control transistor. The semiconductor device further has a dummy transistor that is formed closer than the output control transistor to the electrostatic protection diode, and an output logic determining circuit that keeps the output signal at a predetermined logic level so long as the parasitic transistor formed between the electrostatic protection diode and the dummy transistor is on. With this configuration, malfunctioning caused by a parasitic transistor can be prevented without the use of an externally fitted component.
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