CD74HCT165M96G4 datasheet by Texas Instruments

CD74HCT165M96G4 Frequently Asked Questions (FAQs)

• What is the maximum clock frequency for the CD74HCT165M96G4?
  The maximum clock frequency for the CD74HCT165M96G4 is 30 MHz, but it can operate up to 40 MHz with a reduced voltage supply (VCC) of 4.5V.
• How do I ensure proper signal integrity and termination for the CD74HCT165M96G4?
  Use a series termination resistor (Rs) of 22-33 ohms at the clock input (CLK) and a parallel termination resistor (Rt) of 220-330 ohms at the data inputs (D0-D7) to ensure signal integrity and prevent reflections.
• What is the recommended power-on reset (POR) circuit for the CD74HCT165M96G4?
  A simple POR circuit can be implemented using a 10kΩ resistor, a 10uF capacitor, and a diode (e.g., 1N4148) connected to the VCC pin. This ensures a clean power-up sequence and prevents latch-up.
• Can I use the CD74HCT165M96G4 with a 3.3V supply voltage?
  Yes, the CD74HCT165M96G4 is compatible with 3.3V supply voltage, but the maximum clock frequency is reduced to 20 MHz. Additionally, ensure that the input signals are within the recommended voltage range (Vih = 2.4V, Vil = 0.8V) for proper operation.
• How do I handle the asynchronous clear (CLR) input on the CD74HCT165M96G4?
  The CLR input should be tied to VCC through a 1kΩ-10kΩ resistor to prevent unwanted clearing of the shift register. If asynchronous clearing is required, ensure that the CLR input is driven by a signal with a rise time of <10 ns to prevent metastability issues.