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SN74AVCH16T245GR VCCA 2.5V VCCB 3.3V 上电后 VCC被拉成3.3V



在同一板上用了三个SN74AVCH16T245GR芯片,排查发现是DIR置低的那颗芯片导致的问题,其他两个芯片没有问题。换新的芯片后会好,但是不过多久又是这个状态,但是勉强能正常工作~这是怎么回事呢