Z9952AA, Z9953, Z9953AA

The Z9953 is a PLL based clock generator that provides low skew and low jitter clock outputs for high performance systems. The Z9953 features a differential PLL to minimize cycle-to-cycle and phase jitter. The PLL is ensured stable operation given that the VCO is configured to run between 200MHz and 500MHz. The input reference is a differential LVPECL clock. All other control inputs are LVCMOS/LVTTL compatible The Z9953 features 9 LVCMOS/LVTTL compatible outputs each capable of driving two series terminated 50Ω transmission lines. With this capability the Z9953 has an effective fan-out of 1:18. The outputs can also be tri-stated when MR/OE# is set high.

When used as a zero-delay buffer any of the 9 outputs can be used as the feedback input to the PLL. The PLL works to align the output edge with the input reference edge thus producing a near zero delay.