Patent ID: 7235829

Claim:
An electronic card comprising: a card terminal which is exposed on a surface of a card; a semiconductor integrated circuit chip including an output terminal connected to the card terminal and an output circuit connected to the output terminal, the output circuit including an output buffer including a first insulated-gate field effect transistor connected to the output terminal, and a drive circuit including a second insulated-gate field effect transistor connected to the gate of the first insulated-gate field effect transistor; and a protection circuit provided in the semiconductor integrated circuit chip and between the output buffer and the drive circuit, the protection circuit configured to protect the first insulated-gate field effect transistor from destruction against a pulse having a pulse width of 1 ns or less applied to the card terminal, the protection circuit including a third insulated-gate field effect transistor connected between a source terminal of the first insulated-gate field effect transistor and the gate of the first insulated-gate field effect transistor, the third insulated-gate field effect transistor formed in an active region in which the first insulated-gate field effect transistor is formed.