FAQ: Logic and Voltage Translation > Ground-Level Translators >> Current FAQ
To use the ground shift capability, voltage supplies need to be isolated and fall within the recommended operating conditions.
Let’s use the figure above as an example. Both supplies are connected together and GNDB shifts by -5V due to parasitics in a long wire. While A-side is fine, B-side exceeds the supply-ground absolute maximum ratings. To avoid similar scenarios, it’s recommended both supplies are isolated.