SN74HC166DRE4 datasheet by Texas Instruments

SN74HC166DRE4 Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with this shift register?
  The maximum clock frequency for the SN74HC166DRE4 is 30 MHz, but this can vary depending on the specific application and operating conditions. It's recommended to check the timing diagrams and clock frequency limitations in the datasheet to ensure proper operation.
• How do I ensure that the shift register is properly initialized on power-up?
  To ensure proper initialization, it's recommended to tie the CLR (clear) input low during power-up to reset the shift register. Additionally, the clock input should be held low until the power supply has stabilized to prevent unwanted clocking of the device.
• Can I use this shift register in a 5V system?
  The SN74HC166DRE4 is a CMOS device that operates from 2V to 6V, making it suitable for use in 5V systems. However, it's essential to ensure that the input and output voltage levels are within the recommended operating range to prevent damage or malfunction.
• How do I handle the asynchronous clear input (CLR) in my design?
  The CLR input is an asynchronous active-low input that resets the shift register when pulled low. To use this input effectively, ensure that it's properly debounced and synchronized with the clock signal to prevent unwanted clearing of the shift register.
• What is the maximum capacitive load that can be driven by the output pins?
  The maximum capacitive load that can be driven by the output pins of the SN74HC166DRE4 is 50 pF. Exceeding this limit can cause output signal degradation or even device malfunction.