SN74HC594DWR datasheet by Texas Instruments

SN74HC594DWR Frequently Asked Questions (FAQs)

• What is the maximum clock frequency that can be used with the SN74HC594DWR?
  The maximum clock frequency is 25 MHz, but it can vary depending on the capacitive load and the operating voltage. It's recommended to check the timing diagrams and clock frequency limitations in the datasheet.
• How do I ensure that the output data is synchronized with the clock signal?
  To ensure synchronization, the clock signal should be connected to the CLK input, and the output data should be latched on the rising edge of the clock signal. This can be achieved by using the SRCLK input to clock the data out of the shift register.
• What is the purpose of the SRCLR input, and how do I use it?
  The SRCLR input is an asynchronous clear input that resets the shift register to its initial state. When SRCLR is low, the shift register is cleared, and all outputs are set to low. This input can be used to reset the shift register during power-up or when a reset is needed.
• Can I use the SN74HC594DWR as a serial-to-parallel converter?
  Yes, the SN74HC594DWR can be used as a serial-to-parallel converter. The shift register can be loaded with serial data, and then the parallel output can be accessed through the Q0-Q7 outputs.
• What is the maximum output current that the SN74HC594DWR can sink or source?
  The maximum output current that the SN74HC594DWR can sink or source is 25 mA per output pin. However, the total current drawn from the VCC pin should not exceed 70 mA.