The multiplexer FOA4400, FIFO FOA9400, demultiplexer FOA5400 and CDR FOA5401 feature CML interfaces, integrated VCOs (Voltage-Controlled Oscillator) and two reference clocks (622 MHz/2.5 GHz). The FOA4400 incorporates the CMU and selectable 20 GHz and 40 GHz clock outputs, whereas optional data synchronization is provided by the FOA9400. The FOA5400 and FOA5401 integrate CDR and demultiplexing functionality with extremely high input sensitivity.