CD74HCT297E datasheet by Texas Instruments

CD74HCT297E Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with CD74HCT297E?
  The maximum clock frequency for CD74HCT297E 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 and perform simulations to ensure the desired frequency can be achieved.
• How do I ensure that the CD74HCT297E is properly powered and decoupled?
  To ensure proper power and decoupling, use a 5V power supply with a minimum of 10uF decoupling capacitor between VCC and GND, and place it as close to the device as possible. Additionally, use a 0.1uF decoupling capacitor between VCC and GND for each 10 inches of trace length.
• What is the recommended layout and routing for the CD74HCT297E?
  For optimal performance, keep the clock signal traces short and away from noisy signals. Use a solid ground plane and avoid vias under the device. Keep the input and output traces separate and use a 50-ohm impedance-controlled trace for the clock signal.
• How do I handle the asynchronous reset input (MR) in my design?
  The asynchronous reset input (MR) should be tied to VCC through a pull-up resistor (e.g., 1kΩ) to ensure proper reset operation. When MR is low, the device is reset, and all outputs are set to a high-impedance state.
• What is the maximum capacitive load that can be driven by the CD74HCT297E?
  The maximum capacitive load that can be driven by the CD74HCT297E is 50pF, but it's recommended to keep the load capacitance as low as possible to ensure reliable operation and minimize signal degradation.