Rated at 400 Mbps, this driver delivers a 200 MHz equivalent clock frequency over the differential pair. In practice, that gives you about 1.6 ns of bit period, which leaves comfortable margin for cable lengths up to a few meters or PCB traces with moderate skew, as long as the receiver side has at least 100 mV of differential threshold. If your system runs at lower rates like 100 Mbps or 200 Mbps, the DS90LV011ATMFX still works cleanly — the 400 Mbps rating is the maximum, not a floor.
Obsolete — plan your replacement now
The DS90LV011A (without the 'TMFX' suffix) is a common drop-in replacement that shares the same SOT-23-5 footprint and 400 Mbps rating, though verify the exact order code and datasheet revision for your supply-voltage and temperature requirements.