CD74HCT165ME4 datasheet by Texas Instruments

CD74HCT165ME4 Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with CD74HCT165ME4?
  The maximum clock frequency for CD74HCT165ME4 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 or testing to determine the maximum clock frequency for a specific application.
• How do I ensure that the CD74HCT165ME4 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 supply lines with 0.1uF and 10uF capacitors. Additionally, use a 10kΩ pull-up resistor on the OE (Output Enable) pin to prevent floating outputs.
• What is the maximum input voltage that can be applied to the CD74HCT165ME4?
  The maximum input voltage for CD74HCT165ME4 is 5.5V, which is the absolute maximum rating. However, it's recommended to keep the input voltage within the recommended operating range of 4.5V to 5.5V to ensure reliable operation.
• Can I use the CD74HCT165ME4 with a 3.3V power supply?
  No, the CD74HCT165ME4 is not compatible with 3.3V power supplies. It's designed to operate with a 5V power supply, and using a 3.3V power supply may result in unreliable operation or damage to the device.
• How do I handle the asynchronous clear (CLR) input on the CD74HCT165ME4?
  The asynchronous clear (CLR) input is active-low, meaning it clears the shift register when it's low. To use the CLR input, connect it to a logic low signal when you want to clear the shift register, and connect it to a logic high signal when you want to allow normal operation.