| abstract |
An IC card includes a data memory portion (503) having a plurality of storage devices. The data storage devices each has: a semiconductor substrate, a well region provided in a semiconductor substrate, or a semiconductor film disposed on an insulator; a gate insulating film formed on the semiconductor substrate, the well region provided in the semiconductor substrate, or the semiconductor film disposed on the insulator; a single gate electrode formed on the gate insulating film; two memory function parts formed on opposite sides of the single gate electrode; a channel region disposed under the single gate electrode; and diffusion layer regions disposed on both sides of the channel region. Incorporating a memory using the storage devices, which allow further miniaturization, provides an IC card at low cost. |