We have two circuit cards that use several DS90LT012AQ and DS90LV011AQ LVDS interfaces to communicate between each other. Both discrete signals and serial communication is transmitted with these LVDS interfaces. Each circuit card has it's own 3.3 V supply derived from a shared 15 V supply. If one circuit card were to have it's 3.3 V supply go over-voltage, possibly to the 15 V rail, what damage to the interfaces can we expect? I see the absolute maximum supply rating of these devices is 4.0 V from their datasheets.
If the DS90LV011AQ driver experienced an over-voltage on it's supply, would it transmit a damaging voltage to the corresponding DS90LT012AQ receiver?
Would the receiver be damaged such that it could draw excessive current from the still health 3.3 V supply?
Would the receiver be damaged such that it could deliver a damaging transient to the healthy 3.3 V supply or down stream circuits on the healthy circuit card?
I do not expect a receiver that has been exposed to an over voltage condition on its supply to cause damage to a driver on the healthy circuit card / supply.
Are either of these devices prone to Latch-up when the absolute maximum ratings are exceeded?
Additionally, will a receiver on the circuit card with the over-voltage condition have an output at the supply rail, ground or indeterminate?
Thanks,
Jesse