B3 (a) The data of different logic families are shown in Table B3a. Determine: (i) high level noise margin Vnu when a 74

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B3 A The Data Of Different Logic Families Are Shown In Table B3a Determine I High Level Noise Margin Vnu When A 74 1 (167.25 KiB) Viewed 44 times

B3 (a) The data of different logic families are shown in Table B3a. Determine: (i) high level noise margin Vnu when a 74HCMOS drives a 74TTL; (ii) low level noise margin VNL when a 74TTL drives a 74HCMOS, (4 marks) (4 marks) Parameters 74HCMOS 74TTL 74LSTTL (volt.) 2.2 2.7 2.2 1.0 1.2 1.0 3.0 5.0 2.8 0.5 0.5 Table B3a (b) According to the electrical characteristics in Table B3b, determine the fan- out (HIGH), fan-out (LOW) and overall fan-out of the logic gate when driving the same type of logic gate. VIH(min.) VIL(max.) VoH(min.) VOL(max.) 0.3 (8 marks) Output Current Logic 0, lol 6.2mA Logic 1, IOH 230uA Input Current Logic 0, ILL 0.45mA Logic 1, LTH 17μΑ Table B3b