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TXB0108 输出异常

Other Parts Discussed in Thread: TXB0108

A Port输入3.3v方波,B Port理论应输出5v方波,实际输出的方波,高电平时候用示波器测量只有2.5v左右。

原理图如下:

输出的波形:

感觉挺简单的芯片,找不到原因。请高手解答。