SN74HC138

3-to-8 decoder.

Tutorial / documentation

Analogue circuits

First tests with SN74HC138

  1. Identify the exact SN74HC138 variant, package and manufacturer documentation.
  2. Identify power, ground and signal pins in the documentation. Assemble the circuit with power disconnected.
  3. Follow the manufacturer’s evaluation circuit. Use a current-limited low-voltage supply and the recommended logic levels.
  4. Mesurez les signaux d’entrée et de sortie. Comparez leur comportement à la fonction : décodeur trois vers huit.

SN74HC138

3-to-8 decoder.

  • Identify the exact SN74HC138 variant, package and manufacturer documentation.
  • Identify power, ground and signal pins in the documentation. Assemble the circuit with power disconnected.
  • Follow the manufacturer’s evaluation circuit. Use a current-limited low-voltage supply and the recommended logic levels.
  • Mesurez les signaux d’entrée et de sortie. Comparez leur comportement à la fonction : décodeur trois vers huit.
Technical documentation