CD54ACT139F3A datasheet by Texas Instruments

CD54ACT139F3A Frequently Asked Questions (FAQs)

• What is the recommended operating voltage range for CD54ACT139F3A?
  The recommended operating voltage range for CD54ACT139F3A is 4.5V to 5.5V, although it can operate from 2V to 6V with reduced performance.
• How do I ensure signal integrity when using CD54ACT139F3A in high-speed applications?
  To ensure signal integrity, use a low-impedance PCB, keep signal traces short, and use termination resistors or series resistors to reduce reflections and ringing. Also, consider using a clock buffer or repeater to regenerate the clock signal.
• Can I use CD54ACT139F3A in a 3.3V system?
  Yes, CD54ACT139F3A can operate at 3.3V, but the output voltage swing will be reduced, and the device may not meet the specified propagation delay and transition times. However, it can still be used in 3.3V systems with some performance degradation.
• How do I handle power sequencing when using CD54ACT139F3A in a system with multiple power supplies?
  To avoid latch-up or damage, ensure that the VCC supply is powered up before the input signals, and that the input signals are stable before the clock signal is applied. Also, consider using a power sequencing controller or a voltage supervisor to ensure proper power-up and power-down sequencing.
• What is the maximum clock frequency that CD54ACT139F3A can handle?
  The maximum clock frequency that CD54ACT139F3A can handle is 100 MHz, although this may vary depending on the specific application, PCB layout, and operating conditions.