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Motorola MPC974FA pll fanout clock driver
Motorola MPC974FA PLL Fanout Clock Driver
The MPC974 is a fully integrated PLL based clock generator and clock distribution chip which operates from a 3.3V supply. The MPC974 is ideally suited for high speed, timing critical designs which need a high level of clock fanout. The device features 15 high drive LVCMOS outputs, each output has the capability of driving a 50 parallel terminated transmission line or two 50 series terminated transmission lines on the incident edge.
The TCLK0 and TCLK1 inputs provide a method for dynamically switching the PLL between two different clock sources. The PLL has been optimized to provide small deviations in output pulse width and well controlled, slow transition back to lock when the inputs are switched between two references that are equal in frequency but out of phase with each other. This feature makes the MPC974 an ideal solution for fault tolerant applications which require redundant clock sources.
The MPC974 is packaged in the 52 lead TQFP package to provide optimum electrical performance as well as minimize board space requirements. The device is specified for 3.3V VCC.
