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Original question:
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当SN74LVC8T245的两侧供电都是3.3V时，如果输入侧的逻辑电平是5V，输出可以正常识别为高电平且不损坏器件吗
您好，
SN74LVC8T245 输入可以到5.5V，可以识别且不损坏器件，它与供电电压无关；
输出电平与供电有关，请查看下面截图：
信号不会倒灌到供电电源是吗
不会，因为它的输入端对电源没有钳位二极管，具体查看下面FAQ:
e2e.ti.com/.../faq-can-the-input-voltage-vi-to-my-logic-device-be-higher-than-the-supply-voltage-vcc
