2.5V, 3.3V Differential 1:8 HCSL Fanout Buffer

The NB3L208K is a differential 1:8 Clock fanout buffer withHigh−speed Current Steering Logic (HCSL) outputs. Inputs candirectly accept differential LVPECL, LVDS, and HCSL signals.Single−ended LVPECL, HCSL, LVCMOS, or LVTTL levels areaccepted with a proper external Vth reference supply per Figures 4and 6. The input signal will be translated to HCSL and provides eightidentical copies operating up to 350 MHz.The NB3L208K is optimized for ultra−low phase noise, propagationdelay variation and low output–to–output skew, and is DB800Hcompliant. As such, system designers can take advantage of theNB3L208K’s performance to distribute low skew clocks across thebackplane or the motherboard making it ideal for Clock and Datadistribution applications such as PCI Express, FBDIMM, Networking,Mobile Computing, Gigabit Ethernet, etc.Output drive current is set by connecting a 475 resistor fromIREF (Pin 27) to GND per Figure 11. Outputs can also interface toLVDS receivers when terminated per Figure 12.