The maximum frequency of operation for the CD74HCT373M is 30 MHz.
Yes, the CD74HCT373M is compatible with 4.5V to 5.5V power supply voltage.
To ensure that the outputs are in a high-impedance state during power-up, connect the OE (Output Enable) pin to VCC or use an external pull-up resistor to VCC.
The CD74HCT373M can sink or source up to 6mA of current per output pin.
Yes, the CD74HCT373M is compatible with 3.3V systems, but the output voltage will be limited to 3.3V.