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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/985768/sn74lvc245a-when-vcc-is-0v-the-maximum-input-voltage-range-of-the-pin-is--0-5-6-5v
在 ？最大额定值，中、引脚的输入电压范围为-0.5~6.5V。该值所需的 VCC 电压是多少
该规格与 VCC 无关、即在断电时也适用。
