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LSF0204转接SPI电平从1.8V转接为3.3V,发现3.3V端拉不低

Other Parts Discussed in Thread: LSF0204

Dear TI sir

   LSF0204电平转接芯片,转接SPI信号,SPI速率为10MHz,A端为1.8V电平,B端为3.3V电平,当在B端上拉300欧姆电阻时,发现B端SPI信号低电平无法完全低,有0.35V左右的电平,当把B端上拉电阻从300欧姆改为4.7K欧姆后,能够拉低,但是SPI的高电平不稳,只有一个2.5V左右的尖端。所以需要请问下如何才能保证SPI转接出来的3.3V电平低能够低到0V上,高能够高到3.3V并且波形平稳

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