STUDY GUIDE

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EET-1241FinalExam.pdf

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1. (15 points) Perform additions of the following unsigned binary numbers.

2. (5 points) What is the output of the comparator circuit below if A = 1010 and B = 1100?

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3. (5 points) Assume the output of the decoder shown is a logic 1. What are the inputs to the decoder?

4. (5 points) For the inputs shown below to the hex decoder, what are the outputs?

5. (5 points) Show how the BCD encoder converts the decimal number 3 into a BCD 0011.

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6. (5 points) In the multiplexer shown below, which data input line is selected if S1S0 = 10? Determine the outputs for the MUX below, given the inputs shown.

7. (10 points Determine the outputs for the DEMUX below, given the inputs shown.

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8. (5 points) Draw the output waveforms for an S-R latch (with active-high inputs) given the inputs shown below. Assume Q is initially LOW and 𝑄𝑄� is initially HIGH.

9. (5 points) Draw the output waveforms for a gated D latch given the inputs shown below.

10. (5 points) Draw the output waveforms for a positive-edge-triggered J-K flip-flop with asynchronous preset and clear inputs, given the inputs shown below. Assume Q is initially HIGH.

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11. (5 points) Find the pulse width for the one-shot circuit shown below.

12. (5 points) Using the timing chart shown below for a 74123, what values of external capacitance and external resistance could you use to get a 1000 ns pulse width? (Note: There is more than one right answer.)

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13. (10 points) Draw the output waveforms of the 74190 counter for the inputs shown below.

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14. (5 points) An 8-bit serial in/serial out shift register has a 1 MHz clock frequency and we desire to use it as a time delay device. What is the total delay through the register.

15. (10 points) Using the generic memory organization map below, show the data path for a READ or WRITE operation (PICK ONE). Label status of 𝐶𝐶𝐶𝐶����, 𝑊𝑊𝑊𝑊�����, and 𝑂𝑂𝑊𝑊����. Label status of all tri-state buffers.

G2

G1

Address lines

Address lines

I/O0

I/O7

CS

OE

WE

Row decoder

Memory array

Column I/O Column decoder

256 rows x 128 columns x

8 bits

Input data control

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Multivibrators

𝑓𝑓 = 1 𝑇𝑇

𝑇𝑇 = 1 𝑓𝑓

tW = 1.1RAC

Memory

1 MB = 220 bytes