Tutorial: 74LS90

Combines, stores or sequences digital signals.

74LS90

Tutorial / documentation

Logic & timing

Quick documentation & first test preparation

  1. Identify component 74LS90 and its package.
  2. Read the truth table or timing diagram.
  3. Check the logic family, power supply and states of unused inputs.
  4. Consult the application circuit in the linked documentation before testing.

74LS90

BCD Counter ( div 2 & div 5 )

  • BCD Counter ( div 2 & div 5 )
  • Read the truth table or timing diagram.
  • Check the logic family, power supply and states of unused inputs.
  • The manufacturer’s pinout and absolute limits take precedence over this page.
Technical documentation

Inputs and outputs must match the function described in the selected reference’s documentation.