The maximum clock frequency of the SN74HCT574PW is 40 MHz.
To ensure that the outputs are in a known state during power-up, connect the OE (output enable) pin to GND or use an external pull-down resistor to ground.
The recommended operating voltage range for the SN74HCT574PW is 4.5V to 5.5V.
Yes, the SN74HCT574PW can be used in a 3.3V system, but the output voltage will be limited to 3.3V. Additionally, the input voltage thresholds may not be compatible with 3.3V logic levels.
The asynchronous reset (RST) input should be tied to VCC through a pull-up resistor to ensure that the device is properly reset during power-up.