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SN74AHC1G14DCKR VCC 大于5.1v ，直接不输出了，不是输入的信号电压有问题。
Hi
感谢您对TI产品的关注！SN74AHC1G14的VCC支持2V~5.5V。
建议参考数据表的5.3 Recommended Operating Conditions看下是否满足芯片的推荐操作条件，以及8 Application and Implementation里面有设计时的注意事项：www.ti.com.cn/.../sn74ahc1g14.pdf
