请问SN74HC595 的输入端连接单片机,是否在芯片输入端需要配置上拉电阻或者下拉电阻,保证单片机在没有输出的情况下数据线电平不会有浮动? 谢谢
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您好,
是的,需要接上拉或下拉,SN74HC595是CMOS输入器件,其输入端不可以浮空,上拉电阻或下拉电阻也需选择合适的值才能正常工作,请查看下面手册第5部分以选择合适的电阻值: