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SN74LVC16T245: 上电过程中输出端出现异常脉冲

Part Number: SN74LVC16T245
Other Parts Discussed in Thread: SN74LXC8T245

使用SN74LVC16T245作为电平转换,A端3.3V,B端5V,方向为从A到B。供电通过DCDC将5V转为3.3V,因此3.3V上电晚于5V,3.3V上电过程中使能端保持上拉到3.3V。测试过程中发现,3.3V上电过程中,输出端B端出现高电平脉冲约100us,即使输入端下拉到GND现象也一样。手册中写到如果使能上拉,输出是高阻的,并且有任何一端的电源在GND时输出都保持高阻。这个现象与手册中的情况不一致,请问原因是什么,不改变上电顺序的前提下有什么解决办法吗