IC card with improved power supply switching circuitry.

摘要

An IC card has its internal load divided into a plurality of load circuits 1, 2 through which substantially equal currents flow, and a power supply switching circuit 41, 42 is provided for each of the load circuits. The switching circuits switch the power supply for the IC card between an internal power supply 3 and an external power supply 7. The load currents flowing through the respective switching circuits are substantially equal.