| 摘要 |
An output buffer circuit includes a first output buffer (1) having a high output resistance determined by DC specifications, a second output buffer (2) having an output resistance satisfying AC specifications when simultaneously driven with the first output buffer (1), and a control circuit (3) for controlling an operation of the second output buffer (2). An input signal is supplied to the input node of the first output buffer (1), and the output node of the first output buffer (1) is connected to an output terminal (OUT). The output node of the second output buffer (2) is connected to the output terminal (OUT). The control circuit (3) is responsive to the potential of the input signal or of the output terminal (OUT) to control the operation of the second output buffer (2). The control circuit (3) drives the second output buffer (2) when the output from the first output buffer (1) is changed, and sets the output from the second output buffer (2) in the high impedance state when the output from the first output buffer (1) is stationary. <IMAGE> |
