TLC5955: Update rate

Team, 

What is the fastest update rate of this part?

Fastest clock speed is 25 MHz for serial input. So assuming I'm using a 1Mhz data transfer speed with 16 bits for all 48 outputs that'd be:

(1/(1 Megahertz))*16-bits*48 Outputs=768 microSeconds?

Thanks

Viktorija