HEF4021BT,653 datasheet by NXP Semiconductors

HEF4021BT,653 Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for HEF4021BT?
  The recommended operating voltage range for HEF4021BT is 3V to 15V, with a typical voltage of 5V.
• How do I handle the propagation delay of the HEF4021BT?
  The propagation delay of the HEF4021BT is typically around 10-20 ns. To handle this, ensure that your clock frequency is not too high, and consider adding buffers or registers to synchronize the signals.
• Can I use the HEF4021BT as a level shifter?
  Yes, the HEF4021BT can be used as a level shifter, but it's not recommended. The device is designed for 5V logic levels, and using it as a level shifter may affect its performance and reliability. Instead, consider using a dedicated level shifter IC.
• How do I ensure the HEF4021BT is properly powered on and off?
  To ensure proper power-on and power-off, make sure to follow the recommended power-up and power-down sequences in the datasheet. Also, ensure that the power supply is stable and within the recommended voltage range.
• Can I use the HEF4021BT in a high-frequency application?
  The HEF4021BT is not designed for high-frequency applications. Its maximum clock frequency is around 10 MHz, and it's not suitable for applications above 20 MHz. Consider using a faster logic family, such as the 74AHC or 74LVC series, for high-frequency applications.