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MPC992 Datasheet(PDF) 6 Page - Motorola, Inc

Part No. MPC992
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Maker  MOTOROLA [Motorola, Inc]
Homepage  http://www.freescale.com

MPC992 Datasheet(HTML) 6 Page - Motorola, Inc

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BR1333 — REV 5
capacitors to the buried power planes. Fat interconnect and
large vias will help to minimize layout induced inductance and
thus maximize the series resonant point of the bypass
No active signal lines should pass below the crystal
interface to the MPC992. The oscillator is a series resonant
circuit and the voltage amplitude across the crystal is
relatively small. It is imperative that no actively switching
signals cross under the crystal as crosstalk energy coupled
to these lines could significantly impact the jitter of the device.
Special attention should be paid to the layout of the crystal to
ensure a stable, jitter free interface between the crystal and
the on–board oscillator. In addition, the crystal interface
circuitry will be adversely affected by activity on the
PECL_CLK inputs. Therefore, it is recommended that the
PECL input signals be static when the crystal oscillator
circuitry is being used.
Although the MPC992 has several design features to
minimize the susceptibility to power supply noise (isolated
power and grounds and fully differential PLL) there still may
be applications in which overall performance is being
degraded due to system power supply noise. The power
supply filter and bypass schemes discussed in this section
should be adequate to eliminate power supply noise related
problems in most designs.

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