CD74HCT21E datasheet by Texas Instruments

CD74HCT21E Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the CD74HCT21E?
  The maximum frequency of operation for the CD74HCT21E is typically 30 MHz, but it can vary depending on the specific application and operating conditions.
• How do I ensure that the CD74HCT21E is properly powered?
  To ensure proper power supply, connect VCC to a 5V power source and GND to ground. Make sure to decouple the power supply with a 0.1uF capacitor to reduce noise and ensure stable operation.
• What is the maximum input voltage that the CD74HCT21E can handle?
  The maximum input voltage that the CD74HCT21E can handle is 5.5V. Exceeding this voltage may cause damage to the device.
• Can I use the CD74HCT21E in a 3.3V system?
  Yes, the CD74HCT21E can be used in a 3.3V system, but the output voltage will be limited to 3.3V. Additionally, the device's performance may be affected at lower voltages.
• How do I handle the unused inputs on the CD74HCT21E?
  Unused inputs on the CD74HCT21E should be tied to VCC or GND through a 1kΩ resistor to prevent floating inputs and ensure proper operation.