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您好,
下面链接文档的第2.1部分 Initial Series of TXS Type Devices,讲了 TXS0102的工作原理,如下截图所示:
看您输入5V波形,低电平是2V,由于输入电压2V小于输出电压3.3V,此时N2 FET是导通的,因此输出也是2V。也就是说输入电压小于期望的输出电压时,输出电压就会跟随输入电压而输出。为了使输出低电平拉低到0V附近,您的输入电压低电平也需要在0V附近。