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TXS0104E 电平转换异常?

Other Parts Discussed in Thread: TXS0104E, TXB0104

SPI接口使用TXS0104E 做1.8V到3.3v电平转换,但是通信失败,示波器看CLK波形,如下:3.3V没有拉上去,请问这是为什么呢?和负载有关系吗?

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