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TXB0108PWR输出电压不稳定

3.3V直接接单片机,5V接接口,由单片机输出掉5V,OE引脚下拉电阻去掉了,然后在单片机直接控制IO口给了一个高电平,将芯片去掉后测单片机引脚输出正常,接上芯片后测3.3V输出引脚

发现电压输出不稳定,下图为采集到的数据,IO口一直为高电平,输出波形如下图