| 摘要 |
An interface circuit is disclosed. When a USB-BUS power source voltage VBUS is not normally supplied to the substrate gates of PMOS transistors of switches of a first switching circuit which controls connecting a terminal D+/RXD to a terminal D-/TXD in an HS driver circuit, and to the substrate gates of PMOS transistors of switches of a second switching circuit which controls connecting the terminal D+/RXD to the terminal D-/TXD in an FS driver circuit 6 ; an amplified core circuit power source voltage DVDD is supplied to the substrate gates of the PMOS transistors. When the USB-BUS power source voltage VBUS is normally supplied to the substrate gates of the PMOS transistors, a USB stabilized power source voltage VUSB is supplied to the substrate gates of the PMOS transistors.
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