(12 points) Circuit Interfacing. Given two families of logic with the given Volt

Question

(12 points) Circuit Interfacing.
Given two families of logic with the given Voltage levels.

a. What is the noise margin high and low (NMH and NML) for Family 1? (use the below table)

1

10011

010110

VOH

VOL

VIH

VIL

Family 1

4.8 V

1.2 V

3.6 V

2.0 V

Family 2

4.2 V

0.2 V

3.2 V

0.8 V

|IOH|

|IOL|

|IIH|

|IIL|

Family 1

360 ?A

10 mA

40 ?A

2 mA

b. According to the specifications above, how many other logic gate inputs can the output of a single gate drive successfully? Briefly justify your answer.

1

10011

010110

Explanation / Answer

Noise Margins

The VTC is generally non-linear

- VIH and VIL are defined as the points at which the slope of the VTC is VIH

- Robustness: NMH =

- Robustness : NML =

Static inverter characteristics for ideal VTC:

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