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关于使用TXB0108 TXB0104 输出信号低电平不低

Other Parts Discussed in Thread: TXB0108, TXB0104

原理图如下:

输出端空载:

输出波形如下:

低电平信号没办法拉低,还有噪声 使用TXB0108 与TXB0104都是同样的问题,请问 可能是哪些原因造成的,输出端没有接负载,引脚悬空