logcira114 lab experiment # 1 - digital logic gates
DESCRIPTION
Logcira114 Lab Experiment # 1 - Digital Logic GatesTRANSCRIPT
DIGITAL LOGIC GATESLaboratory Experiment No. 1
Digital logic gates are often called logic circuit which refers to the circuit with one or more inputs signals but only one output signal. Digital gates are digital (two-state) circuits because the input/s and output signal are either low or high voltages.
Digital logic gates are used to analyze two-valued Boolean algebra. They are chosen for ease of implementation in the relevant physical technologies.
I. OBJECTIVES/MATERIALS
OBJECTIVES:
1. To be able to familiarize the truth table of different digital logic gates.2. To be able to construct a logic circuit using basic digital logic gates3. To be able to familiarize with the different digital logic gates families.
MATERIALS:
Quantity Part Number Item Description1 - Breadboard or Digital Logic Trainer 1 - Logic Probe/LED1 - Variable DC Supply (0 –30Vdc)1 - Digital Multi Meter tester1 TTL 7400 2-inputs NAND gate1 TTL 7402 2 inputs NOR gate1 TTL 7404 Hex Inverter gate1 TTL 7407 Hex Buffer gate1 TTL 7408 2-inputs AND gate1 TTL 7432 2-inputs OR gate 1 TTL 7486 2-inputs XOR gate1 TTL 74266 2-inputs XNOR gate
1 set - Connecting Wires
II. PIN CONFIGURATIONS<maximum of (3) pin configurations per page>
III. PROCEDURES
1. Connect Figure 1.1 in the breadboard or digital logic trainer.2. Obtain the truth table by connecting the input/s of the gate to the GND or +5Vdc (or digital switch), and the output to the logic probe or to the positive pin of LED. Records your outputs to the corresponding table.3. For Figure 1.2 to 1.9, repeat steps 1 to 2.
4. Given the Boolean algebra F = (A + B) C’, connect figure 1.9 and then obtain the truth table.
IV. LOGIC DIAGRAM
Figure 1.1: NAND Gate Figure 1.2: NOR Gate
Figure 1.3: Inverter Gate Figure 1.4: Buffer Gate
Figure 1.5: AND Gate Figure 1.6: OR Gate
2
14
7
1
23
F
LED
5V
B
A5V
TTL7400
7
142
3 1
F
5VA
B
5V
LED
TTL7402
F5V
A5V
LED
TTL7404
F
LED
5VA
5V
TTL7407
F
32
1
7
14
TTL7408
5VA
B
5V
LED
14
7
1
23
F
TTL7432
LED1
5V
B
A5V
F
32
1
7
14
TTL7486
5VA
B1
5V
LED
14
7
1
23
F
TL74266
LED
5V
B
A5V
Figure 1.7: XOR Gate Figure 1.8: XNOR Gate
Figure 1.9: Logic diagram of F = (A + B) C’
V. DATA RESULTS
Table 1.1: Truth Table of NAND gate
A B F0 00 11 01 1
Table 1.2: Truth Table of NOR gate
A B F0 00 11 01 1
Table 1.3: Truth Table of Inverter gate
A F01
Table 1.4: Truth Table of Buffer gate
A F
3
F
1 14
7
7
14
23 14
7
1
23
1 2
LED
5V
TTL7408
5V
TTL7404
C
5VA
B
5V
TTL7432
01
Table 1.5: Truth Table of AND gate
A B F0 00 11 01 1
Table 1.6: Truth Table of OR gate
A B F0 00 11 01 1
Table 1.7: Truth Table of XOR gate
A B F0 00 11 01 1
Table 1.8: Truth Table of XNOR gate
A B F0 00 11 01 1
Table 1.9: Logic diagram of F = (A + B) C’
A B C F0 0 00 0 10 1 00 1 11 0 01 0 11 1 01 1 1
4
VI. DATA ANALYSIS<It should be based on the data you have gathered and minimum of 2 pages>
VII. QUESTIONS
1. How do you obtain the truth table of a given gate without referring to a data book?
2. In Boolean algebra over bar stands for ____.3. How many input and output signal can a gate have?4. If you cascaded seven inverters, does the overall circuits acts like an
inverter or buffer?
VIII. CONCLUSION <It should be based on the objectives and minimum of 2 pages>
IX. REFERENCES
X. PHOTOCOPY OF GROUP FRONT PAGE