I have a legacy LPC MCU with 2 UARTs only. One of these UARTs is reserved for different functions such as IAP and RS232. So basically, I have one UART available only.
For an experimental project I need 5 to 7 UARTs to add 5 to 7 SOC modules.
So, I plan a new hardware with any controller, but due to PCB space and controller limitations I do not expect to have many possibilities to add unlimited UARTs.
Planning some type of extender, I had the idea of using two 1:8 74xx multiplexers in order to switch between UARTs and a common VCC/GND shared by all of the participants in my SOC/MCU chain.
Can you switch safely between UARTs using analog muxes? Or are there ramps/peaks that might lead to UART periphery problems?