Design digital circuits


This unit describes the performance outcomes, skills and knowledge required to design basic digital circuits.

The unit of competency is applied by technicians in a robotics, automation, mechatronics or electronics engineering environment involved in designing digital circuits.

No licensing, legislative, regulatory or certification requirements apply to this unit at the time of publication.


Elements describe the essential outcomes.


Performance criteria describe the performance needed to demonstrate achievement of the element.

1.    Determine the basics of digital systems

1.1.      Identify packaging schemes used for logic circuits

1.2.      Determine the salient characteristics of the 7400 logic families and subfamilies

1.3.      Identify the test equipment used with digital systems

1.4.      Convert numbers between Binary coded decimal (BCD), decimal, binary, octal and hexadecimal

2.    Design, analyze and simulate circuits based on Small-Scale Integration (SSI) Integrated Circuits (ICs)

2.1.      Simplify logic equations with Boolean algebra

2.2.      Simplify logic equations with Karnaugh maps

2.3.      Design combinational logic circuits with SSI gates

2.4.      Simulate logic functions with appropriate simulation software

3.    Design, analyze and simulate circuits based on Medium-Scale Integration (MSI) Integrated Circuits (ICs)

3.1.      Design circuit with a combination of MSI and SSI Integrated Circuits

3.2.      Simulate MSI design with appropriate simulation software

4.    Design, analyze and simulate circuits based on flip-flops (multivibrators)

4.1.      Design an astable multivibrator (oscillator) with digital logic

4.2.      Design a monostable multivibrator (‘one-shot’) with digital logic


Foundation skills essential to performance are explicit in the performance criteria of this unit of competency.


52677WA Module 8 Digital Circuit Design



Assessment requirements for DMCDIG608 Design digital circuits


To achieve competency in this unit a person must satisfy the requirements of the elements and performance criteria included in the unit.

The person must also:

  • correctly and safely construct/simulate and test two different basic digital circuits
  • logically layout and present circuit analysis
  • use Boolean algebra techniques and gate representations


To achieve competency in this unit a person must satisfy the requirements of the elements and performance criteria included in the unit.

This includes knowledge of:

  • interpreting datasheets for the following MSI Integrated Circuits:

(a) Adders

(b) Comparators

(c) Decoders

(d) Encoders

(e) Code converters

(f) Multiplexers

(g) Demultiplexers

  • (h) Parity generators/checkers
  • symbols used in digital circuits
  • interpreting datasheets for the following flip-flops:

(a) S-R

(b) D-type

(c) J-K

(d) Monostable

  • components of a variety of digital circuits identified by a given circuit diagram
  • fundamentals of Boolean algebra


Assessment conditions:

All assessment must be completed in accordance with work health and safety standards.

When assessments are conducted remotely, invigilation software must be used to ensure authenticity of work completed.

Model answers or marking guides must be provided for all assessments to ensure reliability of assessment judgements when marking is undertaken by different assessors.

The candidate must have access to all tools, equipment, materials and documentation required.

Assessor Requirements:

Assessors must satisfy the assessor requirements in the standards for registered training organisation (RTOs) current at the time of assessment.

Assessors must also hold a tertiary qualification in engineering or related field.

The RTO must also ensure that trainers and assessors keep their industry knowledge up to date through ongoing professional development.

The RTO must take appropriate steps, as an ongoing procedure, to verify information about trainer and assessor’s qualifications, vocational competencies and current industry skills.


Software/Hardware Used


  • Wireshark


  •  N/A