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Answer to exercises(3)

A B C Q1 Q2 Q3 Q4 Q5 Q6 Z. L L L off on off on off on 1. L L H off on off on on off 0. V DD. L H L off on on off off on 0. Q 2. A. L H H off on on off on off 0. H L L on off off on off on 0. Q 4. B. H L H on off off on on off 0.

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Answer to exercises(3)

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  1. A B C Q1 Q2 Q3 Q4 Q5 Q6 Z L L L off on off on off on 1 L L H off on off on on off 0 VDD L H L off on on off off on 0 Q2 A L H H off on on off on off 0 H L L on off off on off on 0 Q4 B H L H on off off on on off 0 H H L on off on off off on 0 Q6 C Z H H H on off on off on off 0 Q3 Q5 Q1 A B Z C Answer to exercises(3) (b) Function table P185, 3.11 (a) Circuit diagram (c) Logic symbol

  2. (b) Function table A B Q1 Q2 Q3 Q4 Q5 Q6 Z VDD L L off on off on on off 0 L H off on on off off on 1 H L on off off on off on 1 Q2 A Q6 H H on off on off off on 1 Q4 B Z Q3 Q1 Q5 A Z B Answer to exercises(3) P185, 3.13 (a) Circuit diagram (c) Logic symbol

  3. Answer to exercises(3) P185, 3.16 (a) Function table

  4. A Z B C D Answer to exercises(3) (a) Function table(continuous) (b) Logic diagram

  5. Answer to exercises(3) P185, 3.17 (a) Function table

  6. A B Z C D Answer to exercises(3) (a) Function table (continuous) (b) Logic diagram

  7. Answer to exercises(3) Assume standard 1.5V and 3.5V thresholds for LOW and HIGH. P186, 3.19Solution 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 IILspecifica-tions for 74LS00 are: IIHmax = 20A, IILmax = -0.4mA

  8. VOUT 5.0 o VIN 0.8 1.3 1.6 2.0 Answer to exercises(3) According to Table 3-8 the IOH and IOLspeci-fications for 74FCT138T are: IOHmax = -15mA, IOLmax = 64mA P187, 3.36Solution The hysteresis is VT+-VT-=1.6V-1.3V=0.3V

  9. Answer to exercises(3) P187, 3.39Solution P187, 3.40Solution The answer is the same as Drill 3.39. P187, 3.53Solution DC noise margin=VOHmin-VIHmin  2.7V-2.0V=0.7V (HIGH-state) DC noise margin=VILmax-VOLmax 0.8V-0.4V=0.4V (LOW-state)

  10. Answer to exercises(3) P188, 3.56(a)Solution (a) 74HCT driving 74LS  For 74HCT, VOLmax=0.33V, VOHmin=3.84V For 74LS, VILmax=0.8V, VIHmin=2.0V DC noise margin=VOHminHCT-VIHminLS  3.84V-2.0V=1.84V (HIGH-state) DC noise margin=VILmaxLS-VOLmaxHCT 0.8V-0.33V=0.47V (LOW-state)

  11. Answer to exercises(3) P188, 3.56(a)Solution 74LS driving 74HCT  For 74LS, VOLmax=0.5V, VOHmin=2.7V For 74HCT, VILmax=0.8V, VIHmin=2.0V DC noise margin=VOHmin-VIHmin  2.7V-2.0V=0.7V (HIGH-state) DC noise margin=VILmax-VOLmax 0.8V-0.5V=0.3V (LOW-state)

  12. Answer to exercises(3) P188, 3.57(a)Solution (a) 74HCT driving 74LS For 74HCT, IOLmaxT=4.0mA, IOHmaxT=-4.0mA For 74LS, IILmax=-0.4mA, IIHmax=20A In the LOW-state, no “excess” driving capability is available. In the HIGH-state, 190 inputs “excess” driving capability is available.

  13. Answer to exercises(3) P190, 3.76Solution P190, 3.91Solution

  14. Answer to exercises(3) P191, 3.92Solution (a) Truth table (continuous) (b) Logic expression

  15. Answer to exercises(3) P191, 3.93Solution P191, 3.94Solution

  16. IOH IOL ENn EN1 EN2 ILeakage ILeakage ILeakage ILeakage Dn D1 D2 Yn Y1 Y2 IIH IIL IIL IIH IIH IIL Answer to exercises(3) P191, 3.96Solution

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