74LS190 / 74LS191

Combines, stores or sequences digital signals.

Tutorial / documentation

Logic & timing

Quick documentation & first test preparation

  1. Identify component 74LS190 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.

74LS190

4-bit Synchronous Up/Down BCD Counter

  • 4-bit Synchronous Up/Down 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

74LS191

4-bit Synchronous Up/Down binary Counter

  • 4-bit Synchronous Up/Down 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