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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/1318278/sn54lvth162245-default-logic-output-with-input-disconnected
当通过电阻器拉高1OE/n 时、如果输入(如1A1)未连接、缓冲器的默认逻辑输出是多少？
当/OE 为高电平时、输出被禁用。
当引脚开路时、总线保持电路确保所有输入为低电平或高电平。
