| 摘要 |
PURPOSE:To maintain the consistency of operation time with other semiconductor integrated circuit devices which are combined as a system by providing an output circuit which switches a high impedance state and the output ready state of an input signal. CONSTITUTION:When a selecting circuit 9 sends out an input signal 5 as an output signal 12 by being commanded with selection signals 10 and 11, an output indication signal 4 is transmitted to an output circuit 14 most early and the output ready state and high impedance state are switched most quickly. When the selecting circuit 9 sends out an input signal 8 as the output signal 12 by being commanded with the selection signals 10 and 11, the output indication signal 4 is transmitted to the output circuit 14 most late and the output ready state and high impedance state are switched most late. Even when input signals 6-7 are selected and outputted as the output signal 12, the output indication signal 14 is transmitted to the output circuit 14 after being delayed correspondingly. Therefore, the delay time up to the arrival of the output indication signal 4 at the output circuit 14 is selectable in several ways.
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