Answer to exercises(3)(a) Function table (continuous)(A+B)·C.D一ZDQ8BCQ1Q7A0203040506offHoffoffonononoff-of-ononoffHononoff一1onon一oftonoroffonohoffonofHon工OToffoffHoffoffononHHonon1A(b) Logic diagramBZCD
Answer to exercises(3) (a) Function table (continuous) A B C D Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Z H L L L H L L H H L H L H L H H H H L L H H L H H H H L H H H H on off off on off on off on on off off on off on on off on off off on on off off on on off off on on off on off on off on off off on off on on off on off off on on off on off on off on off off on on off on off on off on off Z = (A + B)CD (b) Logic diagram A B C Z D
Answer to exercises(3)SolutionP186, 3.19Assume standard1.5V and 3.5VDC noise margin=VoHmin-VIHminthresholds for=(Vc-0.5-0.1) -VIHminLOW and HIGH.~ 4.4V-3.5V=0.9V (HIGH-state)DC noise margin=VILmax-VoLmax~1.5V-0.1V=1.4V(LOW-state)P186, 3.25SolutionAccording to Table 3-12 the Ir and Iu specifica-tions for 74LS00 are:IiHmax = 20μA, IiLmax = -0.4mA
Answer to exercises(3) P186, 3.19 Solution DC noise margin=VOHmin-VIHmin =(Vcc-0.5-0.1) -VIHmin 4.4V-3.5V=0.9V (HIGH-state) DC noise margin=VILmax-VOLmax 1.5V-0.1V=1.4V (LOW-state) P186, 3.25 Solution According to Table 3-12 the IIH and IIL specifications for 74LS00 are: IIHmax = 20A, IILmax = -0.4mA Assume standard 1.5V and 3.5V thresholds for LOW and HIGH