| 摘要 |
A semiconductor device comprises an analog switch and digital circuitry, both of which are formed on a single integrated circuit chip and share a node coupled to external circuitry. A first power source, provided in the device, is coupled to an input terminal of the analog switch whose output is operatively coupled to the node, and a second power source is also provided so as to supply electric power to the digital circuitry whose input or output is operatively coupled to the node. A back gate voltage controller, coupled to a back gate of the analog switch, is provided in order to control a voltage applied to the back gate in response to an operation mode control signal for determining whether the analog switch or the digital circuitry is to be enabled.
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