Integrated circuit, having data inputs and outputs (Data(0), Data(1), Data(2), Data(3), DataO(0), DataO(1)), and a control input (ResetX) for receiving a first control signal for the purpose of switching the integrated circuit over between an operating state and a test state, characterized in that the integrated circuit has an identification circuit (5) which is connected to the control input (ResetX), distinguishes between the first control signal and a second control signal and switches the integrated circuit over between the operating state and the test state as a function of the first control signal.