TXS0104E用于SMI电平转换,VCCA是2.5V、VCCB是3.3V,OE端通过4.7k电阻上拉到3.3V了,datasheet上,OE端应该是2.5V电源, 但datasheet上高电平可以支持VCCA × 0.65 ~ 5.5。 实际使用,也发现SMI访问phy存在不稳定现象,请教是OE端失效了?
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OE是参考的VCCA,所以高低电平标准也是参考的VCCA, 上拉的话需要上拉到VCCA, 而不是VCCB,因此使用起来有问题。