ðŦ National Institute of Technology Silchar
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| S No | Questions | Marks | CO |
|---|---|---|---|
| 1. | A digital system has four bits 'ABCD' as inputs. The output Y is equal to '1' when any two adjacent bits are 1, or any three or all four bits are 1. Draw and simplify the K-map. Also, realize Y using minimum number of 2-input and 3-input NAND gates only. | 6 | CO1 |
| 2. | Simplify the following Boolean expression using Quine-McCluskey methodf(A, B, C, D, E) = â m(1,2,12,13,15,17,18,19,20,21,23,24,25,27,29,31) | 8 | CO2 |
| 3. | Implement the following Boolean expression using 2x1 multiplexer and other necessary gates. Assume wâ as select line of multiplexer.f = w1w2 + w1w3 + wĖ3wĖ1 | 4 | CO2 CO3 |
| 4. | Determine the switching function of the threshold element shown in the Figure 1.[Figure shows a threshold gate with: - Input A with weight -2 - Input B with weight 3 - Input C with weight 2 - Threshold value 2 inside the circle] | 4 | CO5 |
| 5. | With proper circuit diagram explain the operation of a TTL NAND gate when both the inputs are at level Low and level High (show the direction of current flow). What are the fan out, noise margin and propagation delay of a standard TTL family? | 5 + 1 | CO5 |
| 6. | Calculate the fan out of a TTL circuit with the following specifications: IOL(max) = 32mA, IIL(max) = 1.6mA, IOH(max) = 400ΞA, IIH(max) = 10ΞA | 2 | 5 |
