Switch control circuit, semiconductor device, and radio communication device

摘要

A switch control circuit has a first terminal, a second terminal, a third terminal, a serial-parallel converter, a selector, a driver circuit and a tri-state buffer. The serial-parallel converter converts a serial switching control signal inputted from the third terminal into first parallel switching control signals when the first terminal is at a first power-supply potential. The selector selects either the first parallel switching control signals converted by the serial-parallel converter or second parallel switching control signals inputted into the second and third terminals, depending on the potential of the first terminal. The driver circuit converts potential levels of the first parallel switching control signals or the second parallel switching control signals selected by the selector and generates parallel switching control signals with potential levels capable of switching a switch circuit.

主权项

1. A switch control circuit, comprising:
a first terminal, a second terminal, and a third terminal; a serial-parallel converter configured to convert a serial switching control signal inputted from the third terminal into first parallel switching control signals in synchronization with a clock signal; a selector configured to select either the first parallel switching control signals or second parallel switching control signals inputted into the second and third terminals, depending on the potential of the first terminal; a driver circuit configured to convert potential levels of the first parallel switching control signals or the second parallel switching control signals, and to generate parallel switching control signals; and a tri-state buffer including an input terminal connected to the serial-parallel converter and an output terminal connected to the third terminal.