Abstract: A noise attenuation output buffer comprising a signal delay circuit for delaying input data for a predetermined time period, a NOR gate for NORing an output signal from the signal delay circuit and an enable signal, a pull-up/down driver for performing a pull-up operation in response to the input data and a pull-down operation in response to an output signal from the NOR gate to provide output data, a noise attenuation controller for outputting a noise attenuation signal in response to a drive voltage, the input data and the output signal from the NOR gate, and a noise attenuator for forming a current path between an output terminal of the NOR gate and a ground terminal in response to the noise attenuation signal from the noise attenuation controller and the output data from the pull-up/down driver to suppress the generation of noise.