Patent ID: 7208978
Filing Date: 2007-04-24
Classification: H03K

Abstract:
1. semiconductor device in which a voltage signal higher than its own power supply voltage may be applied to an output terminal or an input/output terminal, comprising a first PMOS transistor and a second PMOS transistor connected in series between a power supply voltage source and the output terminal or the input/output terminal, wherein the gate terminal of the first PMOS transistor is maintained at the power supply voltage in a non-outputting state, and is driven according to an output signal in an outputting state, and the gate terminal of the second PMOS transistor is set to an applying voltage to be applied to the output terminal or the input/output terminal in an non-outputting state when the applying voltage is in a first region in which the applying voltage is equal to or higher than a voltage of the power supply voltage plus a predetermined voltage, and is set to the power supply voltage when the applying voltage is in a second region in which the applying voltage is less than the voltage of the power supply voltage plus the predetermined voltage.