"SPI Multiplexing IC" and "USB-SPI Bridge IC" recommended

Hi 

1. TMUX1574 does not have the samples in the TI's website and spot market, so I chose the "TS3A44159PWR" for the SPI(1.8V) MUX.

2. I found the USB to SPI bridge solution, but the SPI voltage level of the USB-SPI bridge is 3.3V, so I need the level-shift (1.8V-3.3V) component. I chose the "SN74AXC4T774BQB", would you help check if the SN74AXC4T774BQB is workable?

3. would you help double-check if these components are correct in the block diagram for our application.

Thanks.

Hi 

For item-1, Can I use the TS3A5018DBQR instead of TS3A44159PWR for the SPI MUX?

Thanks.

Derek.