CD74HCT257E datasheet by Texas Instruments

CD74HCT257E Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with CD74HCT257E?
  The maximum clock frequency for CD74HCT257E is 30 MHz, but it can vary depending on the operating conditions and the quality of the clock signal.
• How do I ensure that the CD74HCT257E is properly powered and decoupled?
  To ensure proper power and decoupling, use a 5V power supply, add a 0.1uF ceramic capacitor between VCC and GND, and a 10uF electrolytic capacitor between VCC and GND for bulk decoupling. Also, keep the power and ground traces short and wide.
• Can I use CD74HCT257E with a 3.3V power supply?
  No, CD74HCT257E is designed to operate with a 5V power supply. Using a 3.3V power supply may not guarantee proper operation and may lead to unpredictable behavior.
• How do I handle the unused inputs of the CD74HCT257E?
  Unused inputs should be tied to VCC or GND through a 1kΩ resistor to prevent floating inputs and ensure proper operation.
• What is the maximum current that can be sourced or sunk by the CD74HCT257E?
  The maximum current that can be sourced or sunk by the CD74HCT257E is 6mA per output pin, and 25mA total for all output pins.