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EECE 238 Exam 2: Logic Diagrams, Combinational Circuits, and Sequential Circuits - Prof. M, Exams of Electrical and Electronics Engineering

University of New Mexico (UNM) - GallupElectrical and Electronics Engineering
Prof. Marios S. Pattichis

The instructions and questions for exam 2 of eece 238. The exam covers topics such as logic diagrams, combinational circuits, and sequential circuits. Students are required to find boolean functions, design circuits, and derive state tables and state diagrams. The use of calculators and notes is allowed.

Typology: Exams

Pre 2010

Uploaded on 07/23/2009

koofers-user-hgn
koofers-user-hgn 🇺🇸

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Name: SSN:
EECE 238 Exam 2 Section 1 Nov 16 2000 09:30-10:30 C. Pattichis
Instructions:
1. The test carries 100 points.
2. Allocated time 90 minutes.
3. Answer ALL questions.
4. Allocate your time appropriately based on the given points assigned to each
question and the time constrains you have.
5. The use of a calculator is allowed.
6. Open notes + textbook.
________________________________________________________________________
1. The logic diagram for a 74HC138 MSI CMOS circuit is given in the following
figure. Find the Boolean function for E, and then find the Boolean function for
each of the outputs. What is the function of this circuit?
(15 points)
1
pf3
pf4
pf5
pf8

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Download EECE 238 Exam 2: Logic Diagrams, Combinational Circuits, and Sequential Circuits - Prof. M and more Exams Electrical and Electronics Engineering in PDF only on Docsity!

Name: SSN: EECE 238 Exam 2 Section 1 Nov 16 2000 09:30-10:30 C. Pattichis Instructions:

  1. The test carries 100 points.
  2. Allocated time 90 minutes.
  3. Answer ALL questions.
  4. Allocate your time appropriately based on the given points assigned to each question and the time constrains you have.
  5. The use of a calculator is allowed.
  6. Open notes + textbook.
  1. The logic diagram for a 74HC138 MSI CMOS circuit is given in the following figure. Find the Boolean function for E, and then find the Boolean function for each of the outputs. What is the function of this circuit? (15 points)
  1. A combinational circuit is defined by the following three Boolean functions: F 1 = X+Y + XYZ F 2 = X+Y + XYZ F 3 = XYZ + X+Y Design the circuit with a decoder and external OR gates. Hint: Express F as a Sum of minterms, ie F = (???). (15 points)
  1. A sequential circuit has three D flip-flops X, Y, Z, and one input W. The circuit is described by the following input equations: DX = (YZ + YZ)W + (YZ + YZ)W DY= X DZ= Y (a) Draw the circuit. (b) Derive the state table for the circuit. (c) Draw two state diagrams, one for W=0 and the other for W=1. (30 points)
  1. A sequential circuit has two T flip-flops, no input, and output AB, i.e. the outputs of the two flip-flops. The circuit is shown below. (a) Derive the TA and TB flip flop input equations. (b) Derive the state table. (c) Derive the state diagram of the circuit. (d) Describe in a few sentences the circuit function. (20 points)