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TXB0106PWR使用过程中输出电压的问题

TXB0106PWR使用时,VCCA-3.3V,VCCB-5.0V,OE时能,B端口输入5.1V时A端口输出3.3V,当B端口输入4.9V时A端口输出1.6V,A端口接的芯片输入最大电流在10uA,电路暂时还可以工作,请问造成这种情况的原因是什么?TXB0106PWR这款芯片的驱动能力是多大?