SN54LS165AJ datasheet by Texas Instruments

SN54LS165AJ Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN54LS165AJ can operate at?
  The maximum clock frequency of the SN54LS165AJ is 25 MHz, but it can vary depending on the operating voltage and temperature. It's recommended to check the timing diagrams and specifications in the datasheet for more information.
• How do I ensure that the SN54LS165AJ is properly powered and decoupled?
  To ensure proper power and decoupling, use a high-quality power supply with a low output impedance, and decouple the VCC pin with a 0.1 μF ceramic capacitor to ground. Additionally, use a 10 μF electrolytic capacitor in parallel to filter out any noise or ripple.
• What is the maximum input voltage that the SN54LS165AJ can tolerate?
  The maximum input voltage that the SN54LS165AJ can tolerate is 5.5V, which is the absolute maximum rating. However, it's recommended to operate the device within the recommended operating voltage range of 4.5V to 5.5V to ensure reliable operation.
• How do I handle the asynchronous clear (CLR) input?
  The asynchronous clear (CLR) input should be tied to VCC through a pull-up resistor (e.g., 1 kΩ) to prevent unwanted clearing of the shift register. When CLR is low, the shift register is cleared, and when CLR is high, the shift register operates normally.
• What is the propagation delay time for the SN54LS165AJ?
  The propagation delay time for the SN54LS165AJ is typically around 20-30 ns, but it can vary depending on the operating voltage, temperature, and load capacitance. Check the datasheet for more information on the propagation delay time.