SN74ALS191AD datasheet by Texas Instruments

SN74ALS191AD Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74ALS191AD can handle?
  The maximum clock frequency of the SN74ALS191AD is 30 MHz, but it can vary depending on the operating voltage and load capacitance. It's recommended to check the timing characteristics in the datasheet for specific frequency limits.
• How do I ensure that the SN74ALS191AD 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 to ground. Additionally, use a 10uF electrolytic capacitor to filter the power supply.
• What is the recommended operating temperature range for the SN74ALS191AD?
  The recommended operating temperature range for the SN74ALS191AD is 0°C to 70°C. However, the device can operate up to 85°C with reduced performance and reliability.
• Can I use the SN74ALS191AD in a 3.3V system?
  No, the SN74ALS191AD is a 5V device and is not compatible with 3.3V systems. Using it in a 3.3V system may result in reduced performance, incorrect operation, or even damage to the device.
• 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 ensure that the counter is not inadvertently cleared. When CLR is low, the counter is reset to zero.