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PCA9306问题请教

Other Parts Discussed in Thread: PCA9306

用PCA9306做IIC总线的电平转换,主端1.8V,从端3.3V,之前用的好好的,前天发现时钟发不过来,主端可以测到,100khz和50kh都试过,但过了9306后直接变高电平了,但SDA是好的,SCL没有,一直高电平,换了好几个芯片,情况一样,用的好好的电路,求指点