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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
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组合逻辑：双向总线缓冲器
双向总线缓冲器（收发器）
示例：74VHC245
双向总线缓冲器（收发器）是一种其I/O引脚可配置为输入和输出以接收和发送数据的逻辑电路。
由于收发器允许通过控制信号（DIR）更改信号方向，所以它沿着总线传输，双向传输数据。
以下显示了收发器的应用示例。
双向使用总线信号时，将总线输入和总线输出都通过上拉电阻连接到VCC或GND，以防止在控制信号（DIR）切换信号时输入信号变为开路（未定义）。
切换信号时请注意不要将输出与总线输出短路。
通过在／G为高电平时更改DIR的值，可以轻松更改A和B引脚的方向。
／G为高电平时，更改DIR的值和外部数据的方向。
在周期#0，数据从B传输到A。
在周期#1，A引脚处于高Z状态。因此，输出数据无效。
在周期#2，更改DIR的值和外部数据的方向。
在周期#3，启用A和B引脚。然后，输出数据在周期#4开始时保持稳定。
在周期#4，数据从A传输到B。.
