High speed output circuit and high speed input circuit for selectively changing swing width of input and output signals and method for changing swing width of input and output signals

摘要

Alternatively high-speed for changing the swing width of the output signal output circuit, high-speed input circuit, and the swing width change method of the output signal is disclosed. High-speed output circuit of a semiconductor device according to the invention is characterized in that an output drive circuit and the drive control circuit. Outputting an output driving circuit output signal in response to the output control signal and, in response to the swing width control signal to change the magnitude of the voltage swing width of the output signal. Outputting an output control signal in response to the control signal and the internal driving circuit, in response to the swing width control signal to change the magnitude of the voltage swing width of the output control signal. The parasitic capacitance at the high speed in accordance with the invention the output circuit, high-speed input circuit and a swing width change method of the output signal may increase or decrease the voltage swing width of the output signals and the input signal, an output node and input node, It has the advantage of reducing the values.