The maximum frequency of operation for the CD74HC574E is 25 MHz.
Yes, the CD74HC574E is compatible with 5V systems, but it can also operate at lower voltages down to 2V.
It is recommended to power up the VCC pin first, followed by the input signals, and then the output enable (OE) pin. During power-down, the OE pin should be disabled before the input signals, and finally the VCC pin.
The CD74HC574E can sink up to 6mA and source up to -6mA per output pin.
The CD74HC574E is rated for operation up to 125°C, but it's recommended to derate the device for reliable operation above 85°C.