of University Illinois at Chicago Department of Electrical and Computer Engineering ECE 265 - Introduction to Logic Design Spring 2004 Semester
Experiment # 1 Digital Circuits and Truth Tables
(due during Week 3 lab session) Lab Report Cover Sheet Web code1: Last name: First name: Signature:
Total score (out of 50 pts.):
______
Overall quality of oral presentation: Circuit operates as specified: Neatness of circuit construction: Professional appearance of lab report: Correctness of lab report content:
_____ / 10 _____ / 10 _____ / 10 _____ / 10 _____ / 10
1
Choose any four alphanumeric characters that will be used to identify you when grades are posted on the class web page (do not use last four Social Security number digits!)
2004
University of Illinois at Chicago
ECE 265 V. Goncharoff
ECE 265 - Lab Experiment #1
Circuit 1:
+5v
1 2 14 7408 7 1 3
+5v
14 7404 7 2 1 2
+5v
14 7400 7
A
B
3 2
gnd +5v
14 7402 7 1
gnd
3
C
gnd
gnd
1. Draw a truth table for Circuit #1. Include columns for intermediate binary variables (e.g. pin 3 of 7408, etc., themselves functions of A, B). 2. Write a Boolean algebraic expression for output variable C in terms of variables A and B. It need not be in simplified form. Before proceeding, make sure that you have read pp. 1-30 of the lab manual. 3. Construct Circuit #1. Set the values of input variables A,B using a switch and resistor combination as shown in Figures 1.5 and 3.9 of the lab manual. Measure the value of output variable C by connecting LED/resistor an series combination, as shown in Figures 1.6 and 3.8 of the lab manual, to the NAND gate output. Verify that the circuit operation is correctly predicted by your truth table in part 1.
Circuit 2: (consult the lab manual data sheets, beginning at p. 31, for IC pinouts)
C
A
B D
E
2004
University of Illinois at Chicago
ECE 265 V. Goncharoff
4. Draw a truth table for Circuit #2. Include two columns for input binary variables A,B; include 2 columns for intermediate binary variables C, D; and include a column for output binary variable E. 5. Write Boolean algebraic expressions for variables C, D and E in terms of variables A and B. 6. Construct Circuit #2 (alongside Circuit #1). Set the values of input variables A,B and measure the value of output variable as with Circuit #1. Verify that the circuit operation is correctly predicted by your truth table in part 4. 7. Demonstr...