SN74F138D datasheet by Texas Instruments

SN74F138D Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the SN74F138D?
  The maximum frequency of operation for the SN74F138D is typically 30 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the SN74F138D is properly powered and decoupled?
  To ensure proper operation, the SN74F138D should be powered with a stable 5V supply, and decoupling capacitors (e.g. 0.1uF and 10uF) should be placed close to the device to filter out noise and reduce electromagnetic interference (EMI).
• What is the maximum current that the SN74F138D can sink or source?
  The SN74F138D can sink or source up to 24mA of current per output, but it's recommended to limit the current to 16mA or less to ensure reliable operation.
• How do I handle the enable inputs (E1, E2, E3) to ensure proper operation?
  The enable inputs (E1, E2, E3) should be driven with a valid logic level (either high or low) to ensure proper operation. If an enable input is not used, it should be tied to a valid logic level to prevent unintended operation.
• What is the propagation delay of the SN74F138D?
  The propagation delay of the SN74F138D is typically around 10-15ns, but it can vary depending on the specific application and operating conditions.