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用74LS161及必要的门电路设计一个十进制计数器，并用MULTISUM仿真

2025-02-12 16:32:18

推荐回答（2个）

回答1：

161是4位2进制、可预置同步计数器。十进制计数器，输出最大值是9（Q3Q2Q1Q0 = 1001），数据输入端置0（D0 = D1 = D2 = D3 = 0），输出最大值9取反，去控制置数端（LD' ，9脚），161会等到下一个时钟脉冲才置入数据，完成溢出归零控制。
LD' = (Q0 * Q3)'

回答2：

有电路图，没有仿真！

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