CD74HCT138E datasheet by Texas Instruments

CD74HCT138E Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the CD74HCT138E?
  The maximum frequency of operation for the CD74HCT138E is typically 30 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the CD74HCT138E is properly powered?
  To ensure proper power supply, connect VCC to a 5V power source and GND to a common ground. Make sure to decouple the power supply with a 0.1uF capacitor to reduce noise and ensure stable operation.
• What is the maximum current that the CD74HCT138E can sink or source?
  The CD74HCT138E can sink or source up to 6mA of current per output pin, but it's recommended to limit the current to 4mA 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) must be connected to a valid logic level (either VCC or GND) to ensure proper operation. Leaving them floating can cause unpredictable behavior.
• What is the propagation delay of the CD74HCT138E?
  The propagation delay of the CD74HCT138E is typically around 10-15ns, but it can vary depending on the specific application and operating conditions.