Download Mata Kuliah Tehnik Digital Jurusan Fisika FMIPA Univ. Jember

Mata Kuliah Tehnik Digital
Jurusan Fisika FMIPA Univ. Jember
Freely translated by
Yuda C Hariadi
Ekperimen 1
Pintu Gerbang Logika
NIM :…………………………………..
Student Name :………………………………………………………….
Date :…………………………………………..
Objectives:
 Mengetahui cara kerja gerbang logika dasar: AND, OR dan NOT.
 Mendiskripsikan cara kerja gerbang logika dengan aljabar Boolean dan table
kebenaran.
Suggested Reading
Technique Digital Books or eBooks by whatever….
Equipment and Components
7404 IC – Hex Inverters, NOT, or similar
7411 IC – AND Gates or similar
7432 IC – OR Gates or similar
toggle switches
Breadboard & wires
voltmeter
0-10 Volt DC power supply
Logic probe (kalau ada, if gak ada ya buat…)
Introduction
The binary system is used for digital logic circuits. Under this system, each input and
output state is either a logic ‘0’ or a logic ‘1’. A high voltage level represents a logic ‘1’
and a logic ‘0’ is a low voltage level. Specific voltage ranges are dependent upon the
logic type or family that is used. A Boolean expression or a Truth Table can describe the
logic operation of a device or circuit. A Boolean expression is an algebraic equation that
defines the relationship between the inputs and outputs. A truth table is used to describe
how the output(s) of a circuit will respond to various input combinations. The
fundamental building blocks of digital systems are the basic logic gates, which include
the AND, NOT (inverter), and OR.
.
 AND ( ) Output is a logic ‘1’ only when all of the inputs are a logic ‘1’
Output is a logic ‘0’ when any or all of the inputs are a logic ‘0’.
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 NOT ( 𝐨𝐯𝐞𝐫𝐛𝐚𝐫) Output state is the opposite of the input state.
 OR, (+) Output is a logic ‘1’ when any or all of the inputs are a logic ‘1’
Output is a logic ‘0’ only when all of the inputs are a logic ‘0’.
Procedure:
1. Refer to the (whatever) textbook or ebook to determine the following:
a. Draw the logic symbol for a 2-input OR gate.
Label the inputs A & B and the output X.
b. Write the Boolean expression for the 2-input OR gate.
c. Complete the truth table for a 2-input OR gate.
A
0
0
1
1
B
0
1
0
1
X
d. Draw in the pin wiring for the 7432 IC (14-pin DIP) or similar OR gates IC. Label
each pin with the corresponding pin number and signal name.
2. The 7432 IC contains four 2-input OR gates. Construct the following OR gate circuit
using one of the OR gates.
NOTE:
Remember to connect the power supply to
the VCC (14) and ground pin 7 on the IC.
VCC = +5 Volts
GND = Ground = 0 volt
3. Set the toggle switches so that both A and B are in the logic ‘0’ level (ground). Verify
the power supply is set to +5V. Turn on the power supply. Using the VOM, measure the
OR gate output voltage. Record the voltage in Table 1. Repeat this procedure for the
remaining 3 input states. Record the output voltage for each input state in Table 1.
Table 1
A
B
0
0
1
1
0
1
0
1
Output Voltage
(Measured)
Output Logic
Level (0/1)
4. Turn off the power supply and disconnect the circuit.
5. Repeat procedure no 1 to 4 for AND gates and NOT ICs.
Question:
1. A technician measures 0.3V at the output for every input combination of a circuit
except when all of the inputs are greater than 4V. What is the logic function of
the circuit? Explain your answer.
2. What would the output logic level (0/1) be for a 5 input OR gate if the input
states were: A = 0, B = 0, C = 0, D = 1, E = 0? Explain your answer.
3. The following circuit is not functioning properly. Based upon the measured
voltage levels shown, determine which component(s) are not functioning.
Explain your answer.
Have a fun