| 摘要 |
<p>An IC card which is low in power consumption and cost, wherein an IC chip is provided with a power source voltage conversion circuit for lowering a power source voltage via a contact so that operating conditions via a contact in terms of an internal circuit power source voltage and a signal level fall within operating conditions via an antenna and with a level conversion circuit for lowering a level of a signal from the contact to the internal circuit and elevating a level of a signal from the internal circuit to the contact.</p> |
