Abstract: An output circuit for outputting a voltage signal to a circuit working with a power supply of a voltage higher than that under which the output circuits works, having an advantage that the voltage signal quickly increases to the potential level of the power supply of the output circuit, an input circuit for receiving a voltage signal from a circuit working with a power supply of a voltage higher than that under which the output circuits works and for forwarding the voltage signal to a circuit working with a power supply of a voltage identical to that under which the input circuit works, having an advantage that the potential level of the forwarded signal is the voltage of the power supply of the input circuit and the an input/output circuit having the foregoing both advantages.

Abstract: An output circuit for outputting a voltage signal to a circuit working with a power supply of a voltage higher than that under which the output circuits works, having an advantage that the voltage signal quickly increases to the potential level of the power supply of the output circuit, an input circuit for receiving a voltage signal from a circuit working with a power supply of a voltage higher than that under which the output circuits works and for forwarding the voltage signal to a circuit working with a power supply of a voltage identical to that under which the input circuit works, having an advantage that the potential level of the forwarded signal is the voltage of the power supply of the input circuit and the an input/output circuit having the foregoing both advantages.

Abstract: In addition to first and second control circuits, an I/O circuit has a first MOS transistor which includes a gate electrode connected to a first node to which a first signal is input from at least one of a first power supply and an internal circuit, a first electrode connected to the first power supply, and a second electrode connected to a second node. A second MOS transistor includes a gate electrode connected to a third node, a first electrode, a second electrode connected to a second node, and a substrate connected to a fourth node which is in a floating state. A third MOS transistor includes a gate electrode connected to the third node, a first electrode, a second electrode, and a substrate connected to the fourth node.

Abstract: An output circuit includes a first, second and third field effect transistors each having a channel of a first conductivity type. The first field effect transistor includes a gate connected to a first node, a first electrode connected to a first power supply and a second electrode connected to a second node. The second field effect transistor includes a gate connected to a third node, a first electrode connected to the second node, a second electrode connected to a fourth node and a substrate connected to a fifth node. The third field effect transistor includes a gate connected to a sixth node, a first electrode connected to the third node, a second electrode connected to the fourth node and a substrate connected to the fifth node. The output circuit further includes an inverter and a fourth field effect transistor having a channel of a second conductivity type which is opposite the first conductivity type.