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The NB4N121K Evaluation Board was designed to provide a flexible and convenient platform to quickly evaluate, characterize and verify the performance and operation of the device under test NB4N121K. The NB4N121K is a Clock differential input fanout distribution device with 1 to 21 HCSL level differential outputs, optimized for ultra low propagation delay variation. The NB4N121K is designed with HCSL clock distribution for FBDIMM applications in mind. Inputs can accept differential LVPECL, CML, or LVDS levels. Single#150ended LVPECL, CML, LVCMOS or LVTTL levels are accepted with the proper VREFAC supply.