SN74ALS191ADR datasheet by Texas Instruments

SN74ALS191ADR Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74ALS191ADR can handle?
  The maximum clock frequency of the SN74ALS191ADR is 30 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 SN74ALS191ADR 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 pins with 0.1uF ceramic capacitors. Additionally, use a 10uF electrolytic capacitor to filter out any noise on the power line.
• What is the maximum input voltage that the SN74ALS191ADR can tolerate?
  The maximum input voltage that the SN74ALS191ADR can tolerate is 7V, but it's recommended to keep the input voltage within the recommended operating 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., 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 SN74ALS191ADR?
  The propagation delay time of the SN74ALS191ADR is typically around 10ns to 15ns, but it can vary depending on the operating voltage and temperature. Check the datasheet for specific timing characteristics.