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TCA9509: 接上TCA9509时,导致主控时钟和数据的输出波形异常,但TCA9509的输出电平是正常

Other Parts Discussed in Thread: TCA9509, TCA9617A

具体的异常波形如下所示:

这个电压值大概在:750mV,持续时间340nS;

靠近CPU那一边的测试出现这个波形,去掉这个芯片CPU输出波形正常;

应用在3.3V转5V的场景下。

更改外部上拉电阻值、去掉电阻都不会改善。

请问造成这个现象的原因是什么?