CD74HC221E datasheet by Texas Instruments

CD74HC221E Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the CD74HC221E?
  The maximum frequency of operation for the CD74HC221E is typically 10 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the CD74HC221E is properly powered?
  To ensure proper power supply, connect VCC to a stable 2-6V power source, and GND to a reliable ground connection. Also, decouple the power supply with a 0.1uF capacitor to reduce noise and ensure stable operation.
• What is the maximum current that the CD74HC221E can sink or source?
  The CD74HC221E can sink or source up to 25mA of current per output, but it's recommended to limit the current to 10mA or less to ensure reliable operation and prevent overheating.
• How do I handle the asynchronous reset input (MR) on the CD74HC221E?
  The asynchronous reset input (MR) should be tied to VCC through a 1kΩ resistor to ensure proper reset operation. A capacitor can also be added in parallel to filter out noise and ensure a clean reset signal.
• What is the propagation delay of the CD74HC221E?
  The propagation delay of the CD74HC221E is typically around 10-20ns, but it can vary depending on the specific application and operating conditions.