There are many applications in which microprocessors or controllers have a limited number of I/Os. The TMUX121 solution can effectively expand the limited I/Os by switching between multiple buses to interface them to a single microprocessor or controller. A common application where the TMUX121 is as a I³C 1:2 multiplexer. In this application, the TMUX121 is used to route communicating between different peripherals from a single controller or driver within a server, as shown in Figure 8-1. The high bandwidth of the TMUX121 will preserve signal integrity at even the fastest communication protocols that may be used in server applications, such as I³C. Also, because I³C is backwards compatible, any of the peripherals can also be I²C, and the TMUX121 will still support it.

Figure 8-1 Typical Application