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TXS0108EPWR的1.8V低电平不为0的故障

1、以下图一是我设计的原理图,测试I2C1_SDAA管脚(PIN4)时出现图二所示故障,本该低电平是0,结果是有300mV的电压。我的问题是如何消除该300mV的电压,变成0?

2、该故障导致了3.0V一侧的电压异常,有个台阶1.0V,如图二所示。从而导致系统误判是高电平,形成逻辑错误。

图一

图二