DIGITAL LOGIC DESIGN LAB 14:332:233
Digital Logic Design Laboratory (14:332:233)
Rutgers University
Department of Electrical and Computer Engineering
Spring 2026
,DIGITAL LOGIC DESIGN LAB 14:332:233
Table of Contents
Laboratory 1: Introduction to Hardware………………………………………………………3
Laboratory 2: Analysis and Synthesis of Combination Circuits……………………………..10
Laboratory 3: Combinational MSI Circuits………………………………………………….24
Laboratory 4: A Simple 4-bit Arithmetic Logic Unit (ALU)………………………………..28
Laboratory 5: A Simple 4-bit Arithmetic Logic Unit (ALU)………………………………..34
Laboratory 6: Traffic Signal State Machine………………..………………………………..46
,DIGITAL LOGIC DESIGN LAB 14:332:233
Laboratory 1: Introduction to Hardware
Learning Objectives
- Learn to work with equipment
- Assemble circuits on breaddboard
- Build logic circuits with integrated circuits (ICs)
1. Introduction
This lab introduces the basic equipment and tools that you will need to build, power and
characterize logic circuits. Furthermore, you will build two simple logic circuits.
1.1 Equipment
Power Supply
All the integrated circuits (ICs) used in the experiments are from the 74LS family of
TTL circuits, and thus, require a supply voltage of +5V. Your power supply may provide
several adjustable voltages, however , almost certainly will have a separate, non-
adjustable +5V output. You should only connect the protoboard to this output , never
to an adju stable one which can burn your circuit if the voltage is accidentally increased.
Most power supplies have a swit ch to cut off the voltage from the output without turning
off the device. To avoid creating short -circuits you must always cut off the supply
voltage from the breadboard when introducing or removing wires. The supply voltage
should be connected to the breadboard in this way: the ground (GND ) should be
connected to the black jack of the breadboard, and the +5V should be conne cte d
to the red j ack of the breadboard.
Logic Probe
To analyze and debug your circuit you will use the LPlOA logic probe. The probe can
display the logic level at any point in the circuit by touching the point with the metal
tip. For logic values 1 (high), the red LED is on, for logic values 0 (low), the green
LED is on. The switches on the logic probe should be set to
• TTL
• MEM
The power is supplied to the logic probe from the breadboard.
3
, DIGITAL LOGIC DESIGN LAB 14:332:233
1.2 Breadboard
By using a solderless breadboard, you may implement electronic circuits easily. A
breadboard is a tool used for connecting the parts of your circuit. You can easily slide
wires and components into the provided holes which have the right size for hookup
wires and the ends of most components.
Figure 1: Front of a breadboard
Figure 2: Back of a breadboard shown with the back insulation removed
Figure 1 and Figure 2 show the front and back side of a breadboard, respecively. In
Figure 2, the backside of the board has been removed to expose the metal strips
connecting the holes. Don’t remove the backside on your own board. It will make the
board useless. From Figure 2, you can see two long lines on top and bottom of the
boards. These can be used as power lines (power supply and ground (GND)). The short
strips are separated by the divider in the center. The center divider can be used to mount
integrated circuit chips (e.g., logic gates), on the breadboard. IC chips in a Dual In-line
Package (DIP) have two rows of pins. The center divider on the breadboard isolates the
top and bottom rows from one another. As such, you can utilize it for inserting DIP
packages (each row of pins places on one side of the center divider).
1.3 The Input-Control/ Output-Display Unit (ICOD)
This unit is your interface with the circuit s you will design. It is recommended you
implement it carefully and give some thought on how to arrange it in the upper left
block of the breadboard, which should be used only for this purpose.
4
Digital Logic Design Laboratory (14:332:233)
Rutgers University
Department of Electrical and Computer Engineering
Spring 2026
,DIGITAL LOGIC DESIGN LAB 14:332:233
Table of Contents
Laboratory 1: Introduction to Hardware………………………………………………………3
Laboratory 2: Analysis and Synthesis of Combination Circuits……………………………..10
Laboratory 3: Combinational MSI Circuits………………………………………………….24
Laboratory 4: A Simple 4-bit Arithmetic Logic Unit (ALU)………………………………..28
Laboratory 5: A Simple 4-bit Arithmetic Logic Unit (ALU)………………………………..34
Laboratory 6: Traffic Signal State Machine………………..………………………………..46
,DIGITAL LOGIC DESIGN LAB 14:332:233
Laboratory 1: Introduction to Hardware
Learning Objectives
- Learn to work with equipment
- Assemble circuits on breaddboard
- Build logic circuits with integrated circuits (ICs)
1. Introduction
This lab introduces the basic equipment and tools that you will need to build, power and
characterize logic circuits. Furthermore, you will build two simple logic circuits.
1.1 Equipment
Power Supply
All the integrated circuits (ICs) used in the experiments are from the 74LS family of
TTL circuits, and thus, require a supply voltage of +5V. Your power supply may provide
several adjustable voltages, however , almost certainly will have a separate, non-
adjustable +5V output. You should only connect the protoboard to this output , never
to an adju stable one which can burn your circuit if the voltage is accidentally increased.
Most power supplies have a swit ch to cut off the voltage from the output without turning
off the device. To avoid creating short -circuits you must always cut off the supply
voltage from the breadboard when introducing or removing wires. The supply voltage
should be connected to the breadboard in this way: the ground (GND ) should be
connected to the black jack of the breadboard, and the +5V should be conne cte d
to the red j ack of the breadboard.
Logic Probe
To analyze and debug your circuit you will use the LPlOA logic probe. The probe can
display the logic level at any point in the circuit by touching the point with the metal
tip. For logic values 1 (high), the red LED is on, for logic values 0 (low), the green
LED is on. The switches on the logic probe should be set to
• TTL
• MEM
The power is supplied to the logic probe from the breadboard.
3
, DIGITAL LOGIC DESIGN LAB 14:332:233
1.2 Breadboard
By using a solderless breadboard, you may implement electronic circuits easily. A
breadboard is a tool used for connecting the parts of your circuit. You can easily slide
wires and components into the provided holes which have the right size for hookup
wires and the ends of most components.
Figure 1: Front of a breadboard
Figure 2: Back of a breadboard shown with the back insulation removed
Figure 1 and Figure 2 show the front and back side of a breadboard, respecively. In
Figure 2, the backside of the board has been removed to expose the metal strips
connecting the holes. Don’t remove the backside on your own board. It will make the
board useless. From Figure 2, you can see two long lines on top and bottom of the
boards. These can be used as power lines (power supply and ground (GND)). The short
strips are separated by the divider in the center. The center divider can be used to mount
integrated circuit chips (e.g., logic gates), on the breadboard. IC chips in a Dual In-line
Package (DIP) have two rows of pins. The center divider on the breadboard isolates the
top and bottom rows from one another. As such, you can utilize it for inserting DIP
packages (each row of pins places on one side of the center divider).
1.3 The Input-Control/ Output-Display Unit (ICOD)
This unit is your interface with the circuit s you will design. It is recommended you
implement it carefully and give some thought on how to arrange it in the upper left
block of the breadboard, which should be used only for this purpose.
4
