CD74HC221EE4 datasheet by Texas Instruments

CD74HC221EE4 Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the CD74HC221EE4?
  The maximum frequency of operation for the CD74HC221EE4 is 25 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the CD74HC221EE4 is properly powered?
  To ensure proper power supply, connect VCC to a stable 2-V to 6-V power source, and GND to a reliable ground connection. Also, decouple the power supply with a 0.1-μF capacitor to reduce noise and ensure stable operation.
• What is the maximum current that the CD74HC221EE4 can sink or source?
  The CD74HC221EE4 can sink or source up to 25 mA of current per output pin, but it's recommended to limit the current to 10 mA or less to ensure reliable operation and prevent overheating.
• How do I handle the asynchronous reset input (MR) on the CD74HC221EE4?
  The asynchronous reset input (MR) should be tied to VCC through a pull-up resistor (e.g., 1 kΩ) to ensure that the device is not inadvertently reset. When MR is low, the device is reset, and all outputs are set to a high-impedance state.
• What is the propagation delay time for the CD74HC221EE4?
  The propagation delay time for the CD74HC221EE4 is typically around 10 ns to 20 ns, depending on the operating frequency and temperature. This delay time is the time it takes for the output to change state after the input has changed.