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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/1302107/sn74lvc2t45-input-supply
你好，TI专家，
SN74LVC2T45的datasheet中的10.1中要求"首次加电输入电源"、请问这里的input supply是VCCA还是VCCB？还是与DIR的值有关？
您好！
器件的输入与 DIR 引脚的配置相关。
谢谢、您可能还会看到具有更强大电源时序功能的较新版本器件(SN74LXC2T45)。
此致、
迈克尔.
