Data carrier for operation with and without contacts

A data carrier comprising:

• a first logic circuit;
• a contactless interface circuit;
• at least one coil in which a signal is induced, said at least one coil connected to said first logic circuit through said contactless interface circuit;
• said contactless interface circuit obtaining from the induced signal at least one DC supply voltage, a clock signal and a data signal corresponding to a modulation of the induced signal;
• a controllable switching element having a control input;
• contacts for receiving the at least one DC supply voltage, the clock signal, and the data signal, said contacts being connected to said first logic circuit and having at least one supply-voltage contact receiving the at least one DC supply voltage and a clock-signal contact receiving the clock signal, said at least one supply-voltage contact being connected to said first logic circuit through said switching element;
• and
• a second logic circuit having an input side and an output side, said input side connected to said clock-signal contact and said output side connected to said control input of said switching element.