SN74F138DR datasheet by Texas Instruments

SN74F138DR Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the SN74F138DR?
  The maximum frequency of operation for the SN74F138DR is typically 100 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the SN74F138DR is properly powered and decoupled?
  To ensure proper power and decoupling, use a 5V power supply, add a 0.1uF ceramic capacitor between VCC and GND, and use a 10uF electrolytic capacitor between VCC and GND for bulk decoupling.
• What is the maximum current that the SN74F138DR can sink or source?
  The SN74F138DR can sink or source up to 24mA of current per output, but it's recommended to limit the current to 16mA per output to ensure reliable operation.
• How do I handle the enable inputs (E1, E2, E3) to ensure proper operation?
  The enable inputs (E1, E2, E3) are active-low, so they should be pulled low to enable the corresponding output. Use a pull-up resistor to ensure the enable inputs are high when not in use.
• What is the propagation delay of the SN74F138DR?
  The propagation delay of the SN74F138DR is typically around 10-15ns, but it can vary depending on the specific application and operating conditions.