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https://e2e.ti.com/support/logic-group/logic/f/logic-forum/798724/sn74ahc04-q1-how-to-deal-with-the-unused-pins-of-sn74ahc04qdrg4q1
如何处理 SN74AHC04QDRG4Q1的未使用引脚？是挂起、接地还是上拉至电源电平？
将输入接地、并使输出保持开路。 请参阅 [常见问题解答]如何终止逻辑器件的任何未使用通道？
