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目录
摘要······························································2
引言······························································2
设计目的·····················································2
设计任务·····················································2
电路原理设计·················································2
3-1计时器的设计原理··········································2
3-2计时器的基本逻辑功能······································3
3-3主干电路设计··············································3
3-3-1震荡电路设计··········································3
3-3-2计数器的设计··········································3
3-3-3译码器的设计··········································3
四．电路仿真······················································4
五．系统分析······················································5
5-1基础元件介绍··············································5
5-1-1计数器················································5
5-1-2译码器与显示管········································6
5-1-3振荡器················································8
5-1-4与非门················································8
六．电路的焊接···················································9
七．调试·························································9
八．总结·························································10
参考文献·························································10
致谢·····························································10
附录·····························································11
74LS160构成的60秒计时器
摘要
60秒计时器是采用数字电路实现的数字显示计时装置。本系统由振荡器，计数器，译码器，LED显示器组成。采用74LS系列中小规模集成芯片。
引言
计时器是用数字集成电路做成的现代计时器，与传统的机械钟相比，它具有走时准确、显示直观(有荧光七段数码显示器)、无机械传动装置等优点。而且钟表的数字化给人们生产生活带来了极大的方便。
一.设计目的
在学完了《数字电子技术》课程的基本理论后，能够综合运用所学知识设计和制作实际需要的简单电子电路，系统地进行电子电路的工程实践训练，锻炼动手能力，培养工程师的基本技能，提高分析问题解决问题的能力。
二.设计任务 完成由74LS160构成的60秒计时器
计时器的组成:60秒计时器一般由振荡器，计时器，译码器，LED显示器组成，这些都是数字电路中应用最广泛的基本电路。
三.电路原理设计
3-1 计时器的设计原理：
先构成一个555定时器和分频器产生震荡周期为一秒的标准“秒”脉冲信号，由74LS160采用清零法分别组成六十进制的“秒”计数器。清零法适用于有异步置零输入端的集成计数器。原理是不管输出处于哪种状态，只要在清零输入端加一个有效电平电压，输出会立即
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