数字逻辑第三章作业答案.doc

第3章作业答案：第四版3.5 false : all ones input or all zeros input3.16 反相门所用的晶体管少，非反相门是在反相门的基础上加了反向器构成。3.20 LOW STATE:1.35-0.33(0.1) = 1.02(1.25)V HIGH STATE: 3.84 (4.4)-3.15=0.69 (1.25)V括号里的数值表示输出驱动CMOS负载时的直流噪声容限3.56（数据见图3-76）LOW stateHIGH stateVIlmaxVOlmaxnoise marginVIHminVOhminTnoise margin(a) 74HCT driving 74LS0.8V0.33V0.47V2.0V3.84V1.84V74LS driving 74HCT0.8V0.5V0.3 V2.0V2.7V0.7 V(b) 74ALS driving 74HCT0.8V0.5V0.3V2.0V2.7V0.7V 74HCT driving 74ALS0.8V0.33V0.47V2.0V3.84 V1.84V3.57LOW statefanoutHIGH statefanoutOverall fanoutexessstateDriving capability(a) 74HCT driving 74LS4mA/0.4mA=104mA/20mA=20010HIGH3.8mA(b) 74AHCT driving 74S8mA/2.0mA=48mA/50mA=1604HIGH7.8mA