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您好,您的意思是当TXS0104 上电瞬间,1.8V信号是有的,过一段时间,输入端的1.8V信号也没有了是吗? 还是说输入信号一直有,但是输出没有信号?我看您是将OE信号一直上拉的, 建议在上电瞬间, OE拉低,当电压起来稳定之后,再将OE拉高试试呢?