UNIVERSITI MALAYSIA PERLIS

Size: px

Start display at page:

Download "UNIVERSITI MALAYSIA PERLIS"

Maximillian Hancock
6 years ago
Views:

1 UNIVERSITI MALAYSIA PERLIS DIGITAL SYSTEM I (DKT122) LAB 2: LOGIC GATE QUESTION & ANSWER SHEET REPORT MOHAMAD RIZAL BIN ABDUL REJAB SITI ZARINA BINTI MD NAZIRI & SPECIAL THANKS TO : ZULKIFLI HUSIN MOHAMMAD NAZRI BIN MD. NOOR

2 Objective To describe the operation of the Inverter, the AND gate, and the OR gate. To verify the operation of OR, AND, NOT (Inverter) gates. To implement the operation of NAND gate and NOR gate. To construct a simple combinational logic circuits. Equipment s and Components DC Power Supply (fixed 5V) Oscilloscope Multi meter Broad Board Logic gates IC : 1) 74 XX 04 1 unit 2) 74 XX 08 1 unit 3) 74 XX 32 1 unit 4) 74 XX 00 1 unit 5) 74 XX 02 1 unit Resistor (330 Ω) 2 unit LED 2 unit SPDT Switches 4 unit Introduction Digital circuits are often referred as a switching circuits because their control devices (examples, diodes and transistors) are switches between the two (2) extremes of ON and OFF functions. Logic gates have one or more inputs with one output. They respond to various input combinations. A truth table show this relationship between circuits input combinations and its output. To determine the total number of different combinational to be listed in the truth table, the equation must be presented : Number of combinations = 2 n, where n is number of inputs The truth table for a particular circuit explains how the circuit behaves under normal condition. In this lab experiment, the five (5) logic gates had covered like NOT gate, AND gate, OR gate, NAND gate, NOR gate. You should recall that the logic levels either 0 or 1 have voltage assignment. For TTL circuits, a logic 0 can be anywhere from 0V to +0.8V and logic 1 is in the range of +2.0V to +5.0V.

3 Procedure PART 1 : NOT GATE Figure 2.1 : NOT gate logic diagram 1) Figure 2.1, show the logic symbol for NOT gate. The NOT gate is also known as Inverter. 2) With refer to data sheet for logic IC (74 XX 04). It contain six (6) NOT gates. 3) Draw the schematic diagram for connection given by Figure 2.2. Figure 2.2 : Application model for NOT gate 4) Construct the circuit based on Figure ) Verify the NOT operation by completing the truth table in Table V (Logic 1 ) GND ( Logic 0 ) LED (ON / OFF) LEVEL ( 0 / 1) Table 2.1 : Truth Table of a NOT gate

4 PART2 : AND GATE Figure 2.3 : AND gate logic diagram 1) Figure 2.3, show the logic symbol for AND gate. 2) With refer to data sheet for logic IC (74 XX 08). It contain four (4) AND gates. 3) Draw the schematic diagram for connection given by Figure 2.4. Figure 2.4 : Application model for AND gate 4) Construct the circuit based on Figure ) Verify the AND operation by completing the truth table in Table 2.2. SWITCH (1) SWITCH (2) LED (ON / OFF) LEVEL ( 0 / 1) Table 2.2 : Truth Table of a AND gate

5 PART3 : OR GATE Figure 2.5 : OR gate logic diagram 1) Figure 2.5, show the logic symbol for AND gate. 2) With refer to data sheet for logic IC (74 XX 32). It contain four (4) OR gates. 3) Draw the schematic diagram for connection given by Figure 2.6. Figure 2.6 : Application model for OR gate 4) Construct the circuit based on Figure ) Verify the OR operation by completing the truth table in Table 2.3. SWITCH (1) SWITCH (2) LED (ON / OFF) LEVEL ( 0 / 1) Table 2.3 : Truth Table of a OR gate

6 PART4 : NAND GATE & NOR GATE INPUT (1) INPUT (2) 74 XX 00 OUTPUT (3) INPUT (1) INPUT (2) 74 XX 02 OUTPUT (3) Figure 2.7 : NAND gate logic diagram Figure 2.8 : NOR gate logic diagram 1) Figure 2.7, show the logic symbol for NAND gate and Figure 2.8 show the logic diagram for NOR gate. 2) With refer to data sheet for logic IC (74 XX 00) and logic IC (74 XX 02), draw the schematic diagram for connection given by Figure 2.9. VCC = +5V SPDT SWITCH (1) R = 330Ω LED1 SPDT SWITCH (2) 74 XX 00 LED2 GND R = 330Ω GND 74 XX 02 GND Figure 2.9 : Application model for AND gate 3) Construct the circuit based on Figure ) Verify the operation by completing the truth table in Table 2.4. SWITCH (1) SWITCH (2) LED1 (ON / OFF) LED2 (ON / OFF) Table 2.4 : Truth Table of an operation gate

7 Reviews Question 1) Evaluate Boolean expressions by substituting values and performing the indicated operations: A = 0, B = 1, C = 1, and x = ABC(A + D) D = 1 2) Briefly describe NOR and NAND operation with using inverted inputs. Draw the diagram to prove the result. 3) When the operation of a circuit is defined by a Boolean expression, we can draw a logic circuit diagram directly from that expression. So, construct the logic circuit diagram whose output is.

Exercise 1: AND/NAND Logic Functions

Exercise 1: AND/NAND Logic Functions EXERCISE OBJECTIVE When you have completed this exercise, you will be able to determine the operation of an AND and a NAND logic gate. You will verify your results