Patent ID: 8253255

Claim:
An electronic device comprising: a substrate; a first chip mounted on the substrate and including a first terminal, a second terminal, and an input pad, the first chip formed as a semiconductor time switch to connect the first terminal to the second terminal during a prescribed lifetime and to disconnect the first terminal and the second terminal upon lapse of the prescribed lifetime, the prescribed lifetime have been previously written into the first chip; a second chip mounted on the substrate and including a third terminal connected to the first terminal, a fourth terminal provided as an input terminal for an external device, and an operational device to perform a predetermined operation conditioned upon receipt of an information token; a first memory device mounted on the substrate including a fifth terminal connected to the second terminal and storing the information token for operating the operational device; and an encapsulating member capping the first chip at a portion above the substrate and at least the input pad of the first chip so that the input pad is not accessible at all through any contact wire and is completely sealed from outside from any contact wire.