Patent ID: 7696645

Claim:
A circuit arrangement for voltage switching, the circuit arrangement comprising: a first input terminal for connecting a first voltage; a second input terminal for connecting a second voltage; an output terminal for outputting either the first voltage or the second voltage; a first switching transistor, which is looped between the first input terminal and the output terminal; a second switching transistor, which is looped between the second input terminal and the output terminal; a voltage monitor with an input terminal and an output terminal, the input terminal of the voltage monitor being connected to the first input terminal of the circuit arrangement and a monitoring signal, dependent on the first voltage, is output at the output terminal of the voltage monitor; a resistor, a third transistor, and a fourth transistor, which are looped in series between the second input terminal and a reference potential, a control terminal of the third transistor and a control terminal of the fourth transistor being connected to the output terminal of the voltage monitor; a first inverter with an input terminal and an output terminal, the input terminal of the first inverter being connected to a connection node of the third transistor and the fourth transistor, and the first inverter being supplied by the second voltage; a fifth transistor, a sixth transistor, and a seventh transistor, which are looped in series between the second input terminal and the reference potential, a control terminal of the sixth transistor and a control terminal of the seventh transistor being connected to the output terminal of the voltage monitor, a control terminal of the fifth transistor being connected to the output terminal of the first inverter, and a control terminal of the first switching transistor being connected to a connection node of the sixth transistor and the seventh transistor; and a second inverter being connected to an input terminal and an output terminal, the input terminal of the second inverter being connected to the connection node of the sixth transistor and the seventh transistor, a control terminal of the second switching transistor being connected to the output terminal of the second inverter, and the second inverter being supplied via decoupling diodes by the first or by the second voltage.