M74HC164B1R datasheet by STMicroelectronics

M74HC164B1R Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with the M74HC164B1R?
  The maximum clock frequency is 25 MHz, but it can vary depending on the operating voltage and temperature. It's recommended to check the timing characteristics in the datasheet for specific frequency limits.
• How do I ensure that the shift register is properly reset after power-on?
  The M74HC164B1R has an asynchronous reset input (RST) that can be used to reset the shift register. Connect the RST pin to a power-on reset circuit or a manual reset button to ensure the shift register is properly reset after power-on.
• Can I use the M74HC164B1R as a serial-to-parallel converter?
  Yes, the M74HC164B1R can be used as a serial-to-parallel converter. The shift register can be loaded serially and then the parallel output can be used to drive external devices.
• What is the maximum output current that the M74HC164B1R can sink or source?
  The maximum output current that the M74HC164B1R can sink or source is 20 mA per output pin. However, the total output current should not exceed 100 mA to prevent overheating and ensure reliable operation.
• How do I reduce power consumption when the M74HC164B1R is not in use?
  To reduce power consumption when the M74HC164B1R is not in use, connect the OE (output enable) pin to a logic low to disable the outputs and reduce power consumption. Additionally, consider using a power-down mode or a low-power mode if available.