74LVC138AD,112 datasheet by NXP Semiconductors

74LVC138AD,112 Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the 74LVC138AD?
  The maximum frequency of operation for the 74LVC138AD is typically around 100 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the 74LVC138AD is properly powered and decoupled?
  To ensure proper power and decoupling, connect the VCC pin to a stable 1.65 V to 3.6 V power supply, and decouple the power supply lines with 0.1 μF to 1 μF ceramic capacitors as close to the device as possible.
• What is the maximum current that the 74LVC138AD can sink or source?
  The 74LVC138AD can sink or source up to 24 mA of current per output pin, but it's recommended to limit the current to 12 mA or less to ensure reliable operation.
• How do I handle the enable inputs (E1, E2, and E3) to ensure proper operation?
  The enable inputs (E1, E2, and E3) should be driven with a valid logic level (either high or low) to ensure proper operation. Avoid floating or undefined states on these inputs.
• What is the propagation delay of the 74LVC138AD, and how does it affect my design?
  The propagation delay of the 74LVC138AD is typically around 2.5 ns to 5 ns, depending on the operating conditions. This delay should be considered when designing high-speed circuits or critical timing paths.