集成计数器LS的应用ApplicationofI

集成计数器74LS161的应用ApplicationofIntegratedCounter74LS161主讲人：李聪计数器counter常见的集成芯片Commonintegratedchips123实验目的实验原理实验器材ExperimentalPurposeExperimentalPrinciplesExperimentalEquipment4574LS161管脚认识74LS161功能测试74LS161PinUnderstanding74LS161Functionaltesting674LS161基本应用74LS161BasicApplications目录CONTENTS1实验目的ExperimentalPurposeONE实验目的ExperimentalPurpose1.认识集成计数器74LS1612.测试74LS161的逻辑功能3.学习74LS161的基本应用Understandtheintegratedcounter74LS161Testthelogicfunctionof74LS161Learnthebasicapplicationsof74LS1612实验原理ExperimentalPrinciplesTWO实验原理ExperimentalPrinciples计数器就是通过计数脉冲的个数来实现计数的功能。Acounterisafunctionthatachievescountingbycountingthenumberofpulses.3实验器材ExperimentalEquipmentTHREE实验器材ExperimentalEquipment计数器74LS161集成块Counter74LS161integratedblock474LS161管脚认识Understandingof74LS161pinsFOUR74LS161管脚认识Understandingof74LS161pins74LS161管脚认识Understandingof74LS161pins引脚图Pindiagram逻辑符号图Logicsymboldiagram集成计数器74LS161的逻辑符号图Understandingof74LS161pins计数状态输出端，从高位到低位依次为Q3、Q2、Q1、Q0Thecountingstatusoutputterminal,fromhightolow,isQ3,Q2,Q1,andQ0in计数控制端，高电平有效。Countingcontrolterminal,effectiveathighlevels.计数脉冲输入端，上升沿触发Countingpulseinputterminal,risingedgetriggered异步置0控制端，低电平有效。Asynchronoussetto0controlterminal,effectiveatlowlevel.进位输出端Carryoutputterminal置数数据箱入端，为并行数据输入。Settheinputendofthedataboxforparalleldatainput.同步置数控制端，低电平有效。Synchronoussettingcontrolterminal,effectiveatlowlevels574LS161功能测试74LS161functionaltestingFIVE74LS161功能测试74LS161functionaltesting图74LS161功能测试表74LS161FunctionTestTable74LS161功能测试74LS161functionaltesting电子技术试验台Electronictechnologytestbench74LS161功能测试74LS161functionaltesting卡好74LS161Install74LS16174LS161功能测试74LS161functionaltesting一、输入信号的连接Connectionofinputsignals74LS161功能测试74LS161functionaltesting二、输出信号连接Outputsignalconnection74LS161功能测试74LS161functionaltesting三、使能端接线Enableterminalwiring74LS161功能测试74LS161functionaltesting四、脉冲信号连接Pulsesignalconnection74LS161功能测试74LS161functionaltesting74LS161功能测试74LS161functionaltesting当把RD接1,LD接0，这时ET,EP无论1还是0，输出信号与输入信号相同。并行数据输出。WhenRDisconnectedto1andLDisconnectedto0,theoutputsignalofETandEPisthesameastheinputsignalregardlessofwhetheritis1or0.Paralleldataoutput.674LS161基本应用74LS161BasicApplicationssix74LS161基本应用74LS161BasicApplications当把RD接1,LD接0，这时ET,EP无论1还是0，输出信号与输入信号相同。并行数据输出。WhenRDisconnectedto1andLDisconnectedto0,theoutputsignalofETandEPisthesameastheinputsignalregardlessofwhetheritis1or0.Paralleldataoutput.74LS161基本应用74LS161BasicApplications总结summary1.掌握74LS161的逻辑功能异步置零，同步置数，保持，计数;

1.Masterthelogicalfunctionsof74LS161,suchasasynchronouszerosetting,synchronousnumbersetting,holding,andcounting;2.学习用集成计数器实现N进制计数的方法步骤。2.LearnthemethodsandstepsforimplementingN-arycountingusingintegratedcounters.74LS138译码的条件是什么?Whataretheconditionsfordecoding74LS138?1使能端G1高电平有效，GA、GB低电平有效，即当G1=1，GA=GB=0时译码，否则禁止译码。EnableG1highleveltobeeffective,GA