CY29947

The CY29947 is a low-voltage 200-MHz clock distribution buff-er with the capability to select one of two LVCMOS/LVTTL compatible clock inputs. The two clock sources can be used to provide for a test clock as well as the primary system clock.All other control inputs are LVCMOS/LVTTL compatible. The 9 outputs are LVCMOS or LVTTL compatible and can drive 50Ω series or parallel terminated transmission lines.For series ter- minated transmission lines, each output can drive one or two traces giving the device an effective fanout of 1:18. The out-puts can also be three-stated via the three-state input TS#.Low output-to-output skews make the CY29947 an ideal clock distribution buffer for nested clock trees in the most demand-ing of synchronous systems.

The CY29947 also provides a synchronous output enable in-put for enabling or disabling the output clocks. Since this input is internally synchronized to the input clock, potential output glitching or runt pulse generation is eliminated.