The MPC930/931 is a 3.3V compatible, PLL based clock driver device targeted for high performance clock applications. With output frequencies of up to 150MHz and output skews of 300ps the MPC930/931 is ideal for the most demanding clock distribution designs. The device employs a fully differential PLL design to minimize cycle to cycle and long term jitter.
This parameter is of significant importance when the clock driver is providing the reference clock for PLL's on board todays microprocessors and ASiC's. The device offers 6 low skew outputs, and a choice between internal or external feedback. The feedback option adds to the flexibility of the device, providing numerous input to output frequency relationships.
• OnBoard Crystal Oscillator (MPC930)
• Differential LVPECL Reference Input (MPC931)
• Fully Integrated PLL
• Output Shut Down Mode
• Output Frequency up to 150MHz
• Compatible with PowerPC] and Intel Microprocessors
• 32Lead TQFP Packaging
• Power Down Mode
• ±100ps Typical CycletoCycle Jitter The MPC930 and MPC931 are very similar in basic functionality, but there are some minor differences. The MPC931 has been optimized for use as a zero delay buffer. In addition to tighter specification limits on the phase offset of the device, a higher speed VCO has been used on the MPC931. The MPC930, on the other hand, is more optimized for use as a clock generator. When choosing between the 930 and 931, pay special attention to the differences in the AC parameters of each device.
The MPC930/931 offers two power saving features for power conscious portable or "green" designs. The power down pin will seemlessly reduce all of the clock rates by one half so that the system will run at half the potential clock rate to extend battery life.
The POWER_DN pin is synchronized internally to the slowest output clock rate. This allow
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