Tutorial: 74LS290 / 74LS293

Combines, stores or sequences digital signals.

74LS290 / 74LS293

Tutorial / documentation

Logic & timing

Quick documentation & first test preparation

  1. Identify component 74LS290 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.

74LS290

4-bit BCD counter

  • 4-bit BCD counter
  • 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

74LS293

4-bit binary counter

  • 4-bit binary counter
  • 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.