CD74HC74E datasheet by Texas Instruments

CD74HC74E Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the CD74HC74E can handle?
  The CD74HC74E can handle clock frequencies up to 25 MHz.
• How do I ensure that the flip-flops are properly initialized on power-up?
  To ensure proper initialization, connect the preset (PRE) and clear (CLR) inputs to VCC or GND, and use a pull-up or pull-down resistor to prevent floating inputs.
• What is the recommended operating voltage range for the CD74HC74E?
  The recommended operating voltage range for the CD74HC74E is 2V to 6V, with a typical operating voltage of 5V.
• Can I use the CD74HC74E in a 3.3V system?
  Yes, the CD74HC74E can operate at 3.3V, but the output voltage levels may not be compatible with 3.3V logic. Ensure that the output voltage levels are compatible with your system's requirements.
• How do I handle the asynchronous preset (PRE) and clear (CLR) inputs?
  The preset and clear inputs are asynchronous, meaning they can be asserted at any time, including during clock transitions. Ensure that these inputs are synchronized with the clock signal to avoid metastability issues.