I need to level shift 3V3 to 2V8. I have a 2V8 source but that'll require some patching wires on testpads and as such I would like to avoid it. I'm wondering: would it be safe to feed the SN74LVC245AN the required 2V8 by using a voltage divider (two series resistors) to convert 3V3 to 2V8? It is for a temporary setup which will be used shortly.
I use this chip to shift my 9600 baud 3V3 serial to a 2V8 serial on a SARA-N3. I need to perform a firmware update and made room in my PCB design for the ALT uart to be accessed but forgot about the 2V8. As such I need to convert 3V3 to 2V8 serial. I don't know if the update process requires bidirectional data transfer and as such a simple voltage divider over the TX->RX probably won't be good enough.
The pad on my PCB is quite small, just enough to hold a volt meter probe on it to test for an activated SARA-N3.