M74HC221B1R datasheet by STMicroelectronics

M74HC221B1R Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for the M74HC221B1R?
  The recommended operating voltage range for the M74HC221B1R is 2V to 6V.
• How do I ensure the M74HC221B1R is properly powered?
  To ensure proper operation, the M74HC221B1R requires a stable power supply with a decoupling capacitor (e.g., 100nF) connected between VCC and GND, as close to the device as possible.
• What is the maximum frequency of operation for the M74HC221B1R?
  The maximum frequency of operation for the M74HC221B1R is 20MHz.
• How do I handle the asynchronous reset input (RST) on the M74HC221B1R?
  The asynchronous reset input (RST) should be asserted low to reset the device. The reset pulse width should be at least 10ns to ensure proper reset.
• What is the purpose of the output enable (OE) input on the M74HC221B1R?
  The output enable (OE) input is used to three-state the outputs. When OE is high, the outputs are in a high-impedance state, and when OE is low, the outputs are enabled.