hw4 - CSE2300W Homework 4 1. (10 points) Assuming 74HCT283s...

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CSE2300W Homework 4 1. (10 points) Assuming 74HCT283’s are used, find the critical path of the circuit in Figure 6-89 (on page 482). What’s the delay on the critical path? Table 6-3 on page 367 lists the propagation delay of many chips, including 74HCT283. The implementation of 74x283 is shown in Figure 6-87 on page 480. 2. (20 points) Show how to build each of the following single- or multiple- output logic functions using one or more 74x138 or 74x139 binary decoders and NAND gates. (Hint: Look at the implementation of a decoder and think about how it is related to minterms.) a) F = Σ A,B,C (1, 3, 4, 5, 7) b) F = Σ A,B,C,D (0, 2, 8, 12, 14) c) F = Σ A,B,C,D (2, 3, 4, 5, 8, 10, 12, 14) d) F = Σ A,B,C (0, 2, 4, 5) and G = Σ A,B,C (1, 2, 4, 6) 3. (5 points) Implement F = X Z + X Y with the following types of three-state buffer and a pull-up resistor (if you think it is necessary). Use no more than four three-state buffers. 4. (10 points) Suppose that you are asked to design a new component, a decimal decoder
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This note was uploaded on 03/16/2010 for the course CSE 2300W taught by Professor Shi during the Fall '08 term at UConn.

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hw4 - CSE2300W Homework 4 1. (10 points) Assuming 74HCT283s...

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