SN54LS221J datasheet by Texas Instruments

SN54LS221J Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN54LS221J can handle?
  The maximum clock frequency of the SN54LS221J is 35 MHz.
• How do I ensure that the SN54LS221J is properly powered?
  The SN54LS221J requires a single 5V power supply, and it's recommended to use a decoupling capacitor of 0.1uF to 1uF between VCC and GND to reduce noise and ensure stable operation.
• What is the maximum current that the SN54LS221J can sink or source?
  The SN54LS221J can sink up to 24mA and source up to 12mA per output pin.
• How do I handle the asynchronous reset input (CLR) of the SN54LS221J?
  The CLR input should be tied to VCC through a pull-up resistor (e.g., 1kΩ) to ensure that the device is not inadvertently reset. A low-going pulse on CLR will reset the device.
• What is the propagation delay of the SN54LS221J?
  The typical propagation delay of the SN54LS221J is 10ns, but it can vary depending on the operating conditions and load capacitance.