长 安 大 学
电 子 技 术 课 程 设 计
专 业 车辆工程
班 级 22010901
姓 名 韩塽
指导教师 户外投影灯 顾樱华
日 期 2011、6、26
一、技术要求·············································2
二、摘要·················································2
三、总体设计方案的论证及选择·····························2
1、加法器的选取·····································2 高效自吸泵2、译码器的选取·····································2 3、数码管的选取·····································3
四.设计方案的原理框图，总体电路图，接线图及说明···········3
1、总体原理图·······································3
2、总体接线图·······································4
五.单元电路设计，主要元器件选择与电路参数计算·············4肘型电缆头
1、逻辑开关·········································4
2、加法器设计·······································5
3、译码器设计·······································7
4、数码管设计·······································9
新型化粪池六、收获与体会···········································10
七、参考文献·············································11
八、附件（元器件清单）····································12
评语·····················································13
一.技术要求
1.四位二进制加数与被加数输入
二.摘要
该设计主要包括两个部分：一是用加法器实现四位二进制加数与被加数的输入，二是将相加产生的二进制和数用二位数码管显示，在此设计中加法器是重点，数码显示是难点。数码显示采用计数器，译码器七段译码显示管来实现。加法器分为半加器和全加器，半加器
只能实现两个一位二进制数的相加，其只考虑两个加数本身的求和而不考虑低位来的进数位。目前使用最广泛的二进制加法器是二进制并行加法器。
三.总体设计方案的论证及选择
1.加法器的选取
二进制并行加法器是一种能并行产生两个n位二进制算术和的组合逻辑电路。按其进位方式的不同，可分为串行进位二进制并行加法器和超前进位二进制并行加法器两种类型。所以根据加法器的工作速度选取超前进位加法器。这里供选取的超前进位加法器有74LS283，CT74LS283，SN74LS283，DM74LS283尼龙包胶线
，HD74LS283，M74LS283 可供选择。由于我们是非电专业，对电子器件的选取要求不高，为使设计简单起见所以选74LS283加法器。 制动总泵
2.译码器的选取
译码器是一种具有“翻译”功能的逻辑电路，这种电路能将输入二进制代码的各种状态，按照其原意翻译成对应的输出信号。译码器是组合逻辑电路的一个重要的器件，在显示译码器的选择上有七段译码器和八段译码器。此处选用七段译码器，可供选择的译码器有74LS
247,74LS47,74LS248,74LS48四种种选法，74LS247,74LS47的引脚排列分别与74LS248,74LS48的引脚排列一模一样，两组的功能也差不多。但74LS247，74LS47控制共阳极数码管，74LS248，74LS48控制共阴极数码管。最终选取74LS247译码器。
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