Experiment 1 Experimental Equipment Recognition and Gate Circuits
I. Purpose:
1. To master the logic function test method of gate circuits;
2. To be familiar with the use of oscilloscopes and digital circuit learning machines;
3. To understand the use of TTL devices and CMOS devices.
II. Experimental principles
Static characterization of gate circuits.
Three, experimental equipment and devices
Equipment
1, circuit learning machine
2, multimeter two fast
devices
1, 74LS00 a piece (four 2 inputs and non-gate)
2, 74LS04 a piece (six inverters)
3, CD4001 a piece (four 2 inputs or non-gate). (four 2-input or non-gate)
Four, the experimental content and procedures
1, test the 74LS04 voltage transfer characteristics. Connect the line according to Figure 1-1. Adjust the potentiometer so that VI varies between 0 and +3V, and record the corresponding values of input voltage V1 and input voltage V0. Record at least five sets of data and draw the voltage transfer characteristic.
VI(V) 0 0.5 0.9 1 1.2 1.5
VO(V)
2. Test the input load characteristics of the four-two input and non-gate 74LS00. The test circuit is shown in Figure 1-2. Please use a multimeter to test and fill in the values of VI and VO with the change of RI in Table 1-1, and draw the curve.
Table 1-1
RI 100
300
1K 4.7K 5.1K 6.1K 10K
VI
VO
3. Test the logic function of the and non gate.
Measure the truth table of the 74LS00 two-input and non-gate: fill in the measurement results in Table 1-2.
Table 1-2
74LS00 CD4001
Inputs Outputs Inputs Outputs
AB Y Voltage (V) AB Y Voltage (V)
L L
L H
H L
H H L L
L H
H L
H H
4. Measure the truth table of the CD4001 two-input or non-gate, and fill in the measurement results in Table 1-2.
Note that the use of CMOS circuits is characterized by the following: the supply voltage should be added first, and then access to the input signal; when the power is cut off, the opposite is true, the input signal should be measured first, and then cut off the supply voltage. In addition, the redundant inputs of CMOS circuits should not be left dangling.
V. Preliminary Requirements
1. Read the lab guide to understand the structure of the learning machine;
2. Understand the pin structure of all the devices (74LS00, 74LS04, CD4001);
3. Precautions for the use of the TTL circuit and CMOS circuit.
Figure 1-1 Figure 1-2
Experiment 2 Combinatorial Circuit Test I
I. Objectives of the Experiment
1. To learn and master the method of realizing various combinational logic circuits by Small Scale In Chips (SSIs);
2. To learn to detect faults with the instrument and to troubleshoot the faults. .
II. Experimental Principles
Methods of designing combinational logic circuits with gate circuits.
Third, the experimental content and requirements
1, with TTL and non-gate and inverter to achieve "three switches to control a light circuit." Requirements to change the state of any switch can control the light from bright to extinguish or from extinguish to bright. Try dual four-input and non-gate 74LS20 and six inverters 74LS04 and switches to realize. Test its function.
2, with CMOS and non-gate implementation of "to determine the input and the recipient of the blood type compliance circuit", test its function.
Requirements are as follows:
Human beings are characterized by four basic blood types-A, B, AB, and O. The blood type of a transfusionist and the blood type of a recipient are the same as those of a transfusionist. The blood types of the transfuser and the recipient must conform to the following principles; blood type O can be transfused to any blood type, but a person with blood type O can only receive blood type O; blood type AB can only be transfused to a person with blood type AB, but a person with blood type AB can receive blood of all blood types; blood type A can be given to a person with blood type A and AB; and a person with blood type A can receive blood type A and O; blood type B can be given to a person with blood type B and AB, and a person with blood type B can accept blood type B and O; and a person with blood type B can accept blood type B and O; and a person with blood type B can receive blood type B and O; and a person with blood type B can receive blood type B and O. blood type B can be given to a person with type B and AB blood, while a person with type B blood can receive type B and O blood. Try to design a logic circuit that tests whether the blood type of a transfusionist and a recipient is in accordance with the above. If the blood type of the transfusionist is in accordance with the specified circuit, output a high level (Hint: the circuit requires only four inputs, which form a set of binary digits, each representing a pair of blood type pairs of a transfusionist and a recipient).
The convention is that "00" stands for type "O"
"01" stands for type "A" and "B"
"01" stands for type "A". "
"10" stands for "B"
"11" stands for " AB" type
3. TTL and non-gates and inverters realize a set of logic circuits with functions of their own choosing.
Four, the experimental equipment and devices
1, digital circuits learning machine
2, 74LS20 three (double four-input and non-gate)
3, 74LS04 a piece (six inverters)
4, CD4011 two (four two-input and non-gate)
V. Preliminary requirements
1
1, design your own circuit, draw a wiring diagram (with the specified device design).
2. Develop a program to test the logic functions and draw the necessary tables.
Experiment 3 Combinatorial Circuit Experiment 2
I. Purpose of the experiment
1. To learn and master the method of realizing various combinational logic circuits with the medium-sized chips (MSIs);
2. To learn the function and usage of the chip's enable terminal.
II. Experimental Principles
Methods of designing combinational logic circuits with integrated decoders and data selectors.
Third, the experimental content and requirements
1, 3-8 line decoder 74LS138 and and non-gate to realize two two-bit binary number multiplication arithmetic circuit, test its function.
2. Implement a full subtractor circuit with a four-choice data selector 74LS153 and an AND-FOR gate to test its functionality.
3. Select a combinational circuit of your own choice. Can be realized with a decoder, data selector or four-bit adder and the necessary circuitry.
Four, the experimental equipment and devices
1, digital circuits learning machine
2, 74LS138 two (3-8 line decoder)
3, 74LS00 a piece (four two inputs and the non-gate)
4, 74LS153 a piece (double four choose a data selector)
5, 74LS04 a (six inverter)
6, 74LS283 a (four-bit binary full adder)
7, 74LS20 three (dual 4-input and non-gate)
5, the requirements of the pre-study
1, in advance of the experimental content and related knowledge;
2, their own circuit design. Write the necessary truth tables, expressions, and draw the wiring diagram.
Experiment 4 Timing Circuit Experiment
I. Purpose of the Experiment
1. To master the function and action characteristics of edge JKFF;
2. To master the method of designing synchronous timing circuits with edge JKFF;
3. To be familiar with the logic function of the integrated counters and the role of each control terminal, and to clarify the difference between the synchronous zeroing and asynchronous zeroing;
4, familiar with the cascade expansion of integrated counters;
4, master the medium-scale integrated circuit counter design and implementation of arbitrary counter method.
II. Experimental Principles
Methods of designing synchronous timing logic circuits.
Three, the experimental content and requirements
1, with dual J-K negative edge flip-flop 74LS112 synchronous timing circuit. Its logic function is: synchronous decimal subtraction counter, can be self-starting, with a feed output, test its function (using 8421 code)
2, with synchronous decimal counter 74160 to implement the 36-counter, the requirements of asynchronous clear end, synchronous place end and feed the C terminal, respectively, to test its function.
3. Design a timing circuit of your choice.
Four, experimental equipment and devices
1, digital circuit experiment logic box
2, 74LS112 two (double JK negative edge trigger)
3, 74LS20 two (double four inputs and the non-gate)
4, 74LS04 a (six inverters)
5, 74LS00 A (four two-input and non-gate)
6, 74160 two (synchronous decimal counter chip)
Five, the requirements of pre-study
1, in advance of the experimental content and related knowledge;
2, according to the experimental content of the classroom to complete the topic of the design: draw the experimental circuit diagram. (The main design process should be filled in the experimental report)
3, the development of verification programs.
Experiment V Comprehensive Experiment
One, the purpose of the experiment
Digital Electronics Technology Comprehensive Experiment is for the "Fundamentals of Digital Electronics Technology" course requirements, through the independent completion of a more complex design to train students to comprehensively use the basic knowledge of digital circuits, design, debugging the circuit capacity.
Second, the experimental principle
Combinatorial logic circuits timing logic circuit design methodology.
Three, the experimental content and requirements
Design topics:
(a), design a 4-player quiz logic circuit. Specific requirements are as follows:
1. Each participant controls a button and presses the button to send a robbing signal.
2. The contest host has another button to reset the circuit.
3. After the competition starts, the first person to press the button will correspond to a light-emitting diode light, at this time, the other three people press the button does not work on the circuit.
4. Someone to answer when the buzzer issued 2 seconds, 100HZ sound (buzzer can be 100HZ rectangular pulse directly driven)
(b), the design of a 1 ~ 5 call system. Specific requirements are as follows:
1. 1 priority is the highest, decreasing priority, the lowest 5
2. digital tube to display the number of call signals, no signal call shows "0"; there are more than one signal call to show the highest priority call number.
3. Whenever there is a call, it will send out a call sound with an interval of 2 seconds until there is an answer signal.
(c), design a three-digit digital display can be controlled timer. Requirements are as follows:
1. Timing range of 0 ~ 9 minutes and 59 seconds, accurate to the second;
2. Can realize the power-on automatic zero and manual zero;
3. Three digital tube display time;
4. Can be at any time to start and stop the clock, display the value of the clock at that time.
Four, preview requirements
Choose any one of the above three topics, design the circuit; list the components used; develop an experimental program; record the results of the experiment.
Or you may choose a topic of your own choice and design it with the instructor's permission.
V. Report Requirements
Detailed design steps, logic diagrams, and analysis of experimental results.