
Subject: Digital Electronics/STEM 

1. Topic

Combinational Logic: Truth table to Circuit 


2. Content

Logic Expressions can be derived from a given truth table; likewise,
a truth table can be constructed from a given logic expression. All
logic expressions, whether simplified or not, can be implemented using
AND, OR & Inverter gates.
EALRs: 2.3.3, 2.3.4, 2.4.5, 3.2.2
National Science Standard D Electrical systems 


3. Goals: Aims/Outcomes

The student is expected to:
1. Translate design specifications into truth tables.
2. Extract unsimplified logic expressions from truth tables.
3. Construct truth tables from logic expressions.
4. Use Circuit Design Software(CDS) and a Digital Logic Board(DLB)
to simulate and prototype AOI Logic circuits 


4. Objectives

1.Design combinational logic circuits using AOI logic gates
2.Use circuit design software and digital logic board.
3.Analyze AOI(AND/OR/Invert) combinational logic circuits to determine
their equivalent logic expressions and truth tables. 


5. Materials and Aids

Paper and pencil, Circuit Design software, Digital Logic Board,
Integrated circuits(74LS04,74LS08, 74LS32), jumper wires. 


6. Procedures/Methods

A. Introduction
1.Use of entry task questions.
2.Present scenario where logic designs are used.
3.Map decisions by identifying all possibilities that could occur. 


B. Development
1.After entry task and initial teaching, students should transition
smoothly into analyzing the given scenario. Turn to their computer
and write truth tables as the first step of their analysis.
2.Check for understanding: check to see if the students actually know
what to do by calling on students at random to repeat the directions.
3. During transition from design to actual breadboarding, depending
on the complexity of the transition, the teacher may need to model
the procedure. 


C. Practice
Students will be presented with different scenario that would require
them to create truth tables and derive boolean expressions and circuit
designs.



D. Independent Practice
1.Monitoring: make sure that students are on task, asking questions
to check for understanding.
2. Students will write their reflections based on the guide questions
given by the teacher. 


E. Accommodations (Differentiated Instruction)
1.Questions are repeated for students at the end of the activity
to help them focus their thoughts,learn skills and apply those skills
to solve problems.
2. Working with partners.
3. Teacher may reteach oneonone 


F. Checking for understanding
1.Students will be assessed based on their truth table,boolean expression,
multisim and circuit design
2.Exit ticket/reflection
3.Asking questions/conferring while monitoring 


G. Closure
1. After the class has completed the first few problems in the activity,
the teacher will review these problems with the class to clarify any
misconceptions.
2.The students will have the remainder of the class to complete the
activity 


7. Evaluation

1. How will the knowledge about AOI logic aid you in designing,
building, and testing of a circuit?
2.What are the steps in the design process of converting a set of
design specifications into a functional logic circuit? 

