The maximum operating frequency of the SN54LS241J is 25 MHz.
No, the SN54LS241J is a 5V device and is not compatible with 3.3V systems. You may need to use a level translator or a different device that is compatible with 3.3V systems.
When not in use, the enable inputs (G1 and G2) should be tied to VCC or GND, depending on the desired state of the output. Leaving them floating can cause unpredictable behavior.
The SN54LS241J can sink up to 16mA and source up to 12mA per output.
While the SN54LS241J can be used as a level translator, it is not the most suitable device for this purpose. It is primarily designed as a buffer/driver and may not provide the necessary voltage translation. A dedicated level translator device may be more suitable for this application.