SN74LS166AD datasheet by Texas Instruments

SN74LS166AD Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74LS166AD can handle?
  The maximum clock frequency of the SN74LS166AD is 2.5 MHz, but it can vary depending on the operating voltage and temperature. It's recommended to check the timing characteristics in the datasheet for specific frequency limits.
• How do I ensure that the SN74LS166AD is properly powered and decoupled?
  To ensure proper power and decoupling, connect the VCC pin to a stable 5V power supply, and decouple the power supply lines with 0.1uF ceramic capacitors. Additionally, use a 10uF electrolytic capacitor to filter out any noise or ripple on the power supply lines.
• What is the maximum input voltage that the SN74LS166AD can handle?
  The maximum input voltage of the SN74LS166AD is 5.5V, but it's recommended to keep the input voltage within the recommended operating range of 4.75V to 5.25V 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., 1kΩ) to prevent accidental clearing of the counter. When CLR is low, the counter is reset to zero, regardless of the clock input.
• What is the propagation delay time of the SN74LS166AD?
  The propagation delay time of the SN74LS166AD is typically around 20-30 ns, but it can vary depending on the operating voltage and temperature. Check the datasheet for specific timing characteristics.