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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’. ̅̅̅̅̅̅̅̅̅̅̅̅ 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