I wish to use the THS4520 differential amplifier to receive a differential signal pair from another card via a differential cable. I am concerned about a situation where the THS4520 is powered off, VS+ and VS- at ground, but a signal is applied to the differential inputs. I have examined the specification document and the TI WEB site and the only information I can find of use is the absolute maximum ratings specifications Vi and Vid. Vi states the limit as +-Vs and Vid as 4V. However, neither of these take into the current limiting of the input resistors, Rg. I realize the bias input current is very low when the device has power applied, but I do not know what the input characteristics are when the device is not powered. How can I assure the THS4520 is not damaged if I have a signal applied to the input Rg resistors and the THS4520 is not powered up?