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5509外部中断触发为下降沿，现需要上升沿触发，外部输入信号一个周期中高电平时间为3*784/12M=0.000196s 接反向器的话怎么选型？
需要几路的，输入是什么电平CMOS，TTL？ 可参考如下反相器选型链接：
http://www.ti.com/lsds/ti/logic/inverting-buffer-driver-products.page
