SN74HC74D datasheet by Texas Instruments

SN74HC74D Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that the SN74HC74D can handle?
  The SN74HC74D 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 through a 1-kΩ resistor and a 0.1-μF capacitor to ground, respectively.
• What is the recommended operating voltage range for the SN74HC74D?
  The recommended operating voltage range for the SN74HC74D is 2 V to 6 V, with a typical operating voltage of 5 V.
• Can I use the SN74HC74D in a 3.3-V system?
  Yes, the SN74HC74D can operate at 3.3 V, but the output voltage levels may not be compatible with 3.3-V logic. Ensure that the output voltage levels meet the requirements of the receiving device.
• 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.