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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74hc123.pdf

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