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Title: 74hc123输出低电平的使用方法 Download
 Description: 74hc123输出低电平的使用方法 74HC123 单稳态触发器。它有两种输入,A 为低电平有效,B 为高电平有效, 有两种输出,正好相反。用外接的电阻电容作定时元件,时间自己定,比 74LS 电路易用。 单稳态触发器74HC123 及外围
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