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TXB0104: 突然断掉信号之后不会拉地,维持之前输出

Part Number: TXB0104

麻烦问一下,我是用TXB0104,1.8V和5V的双向转换,当我突然断掉5V(HD_HPD)信号输入时,用示波器测量芯片两端的电压还是1.8V和5V,怎么让它回到0点;如下电路图,麻烦帮忙解答一下,感谢!