CD74HC640E datasheet by Texas Instruments

CD74HC640E Frequently Asked Questions (FAQs)

• What is the maximum frequency of operation for the CD74HC640E?
  The maximum frequency of operation for the CD74HC640E is 25 MHz, but it can vary depending on the specific application and operating conditions.
• How do I handle the power-up and power-down sequencing for the CD74HC640E?
  It is recommended to power up the VCC pin before the VEE pin, and power down the VEE pin before the VCC pin to prevent latch-up and ensure proper operation.
• What is the recommended operating voltage range for the CD74HC640E?
  The recommended operating voltage range for the CD74HC640E is 2V to 6V, with a typical operating voltage of 5V.
• How do I ensure proper termination for the CD74HC640E?
  It is recommended to use a termination resistor (e.g. 33 ohms) at the end of the transmission line to prevent signal reflections and ensure proper signal integrity.
• Can I use the CD74HC640E in a 3.3V system?
  Yes, the CD74HC640E 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 time.