4518 / 4520

Combines, stores or sequences digital signals.

Tutorial / documentation

Logic & timing

Quick documentation & first test preparation

  1. Identify component 4518 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.

4518

Dual BCD Up-Counter

  • Dual BCD Up-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

4520

Dual Binary Up-Counter

  • Dual Binary Up-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