M74HC165B1R datasheet by STMicroelectronics

M74HC165B1R Frequently Asked Questions (FAQs)

• What is the maximum clock frequency for the M74HC165B1R?
  The maximum clock frequency for the M74HC165B1R is 25 MHz, but it can vary depending on the operating voltage and temperature.
• How do I handle the asynchronous reset (RST) input?
  The asynchronous reset (RST) input should be asserted low to reset the shift register. It's recommended to keep RST low for at least 2 clock cycles to ensure a proper reset.
• What is the recommended clock pulse width for the M74HC165B1R?
  The recommended clock pulse width for the M74HC165B1R is at least 2 ns for both high and low levels.
• Can I use the M74HC165B1R in a 5V system?
  No, the M74HC165B1R is a CMOS device and is not recommended for use in 5V systems. It's designed to operate at a supply voltage (VCC) of 2V to 6V, but the recommended operating voltage is 3.3V or 5V tolerant.
• How do I ensure data integrity when using the M74HC165B1R?
  To ensure data integrity, it's recommended to use a clock frequency that is at least 10 times slower than the maximum clock frequency, and to use a clock signal with a duty cycle as close to 50% as possible.