The NB3L8533 is a low skew 1:4 LVPECL Clock fanout buffer designed explicitly for low output skew applications.The NB3L8533 features a multiplexed input which can be driven by either a differential or single−ended input to allow for the distribution of a lower speed clock along with the high speed system clock.The CLK_SEL pin will select the differential clock inputs, CLK and CLKb, when LOW (or left open and pulled LOW by the internal pull−down resistor). When CLK_SEL is HIGH, the Differential PCLK and PCLKb inputs are selected.The common enable (CLK_EN) is synchronous so that the outputs will only be enabled/disabled when they are already in the LOW state.This avoids any chance of generating a runt clock pulse when the device is enabled/disabled as can happen with an asynchronous control. The internal flip flop is clocked on the falling edge of the input clock, therefore, all associated specification limits are referenced to the negative edge of the clock input.

• CLK/CLKb can Accept LVPECL, LVDS, HCSL, STTL and HSTL
• PCLK/PCLKb can Accept LVPECL, LVDS, CML and SSTL
• Four Differential LVPECL Clock Outputs
• 1.5 ns Maximum Propagation Delay
• LVCMOS Compatible Control Inputs
• Selectable Differential Clock Inputs
• Synchronous Clock Enable
• 30 ps Max. Skew Between Outputs
• 650 MHz Maximum Clock Output Frequency