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SN74LVC2T45: input supply问题

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Prodigy 120 points
Part Number: SN74LVC2T45
Other Parts Discussed in Thread: SN74LXC2T45

你好，TI专家，

SN74LVC2T45的datasheet中的10.1中要求“first power-up the input supply”,请问这里的input supply是VCCA还是VCCB？还是与DIR的值有关？