M7010R View Datasheet(PDF) - STMicroelectronics
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Manufacturer
M7010R Datasheet PDF : 67 Pages
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M7010R
POWER DISTRIBUTION GUIDELINE
In order to prevent voltage supply sags that can
potentially degrade device performance, large by-
pass capacitors are often recommended. Since
the bulk storage not only contains an effective se-
ries resistance, but also a fairly high inductance,
the large bypass capacitors should be assisted by
other capacitors that have a lower inductance (but
typically less capacitance). These high frequency
capacitors control the switching transients and
hold-over the power planes during an average
load change until the higher inductance capacitors
can react. High frequency bypass capacitors are
used having values of 0.01uF and 0.1uF.
For a single Search Engine application, a recom-
mended power plane and ground plane may be
laid out as follows:
– A 1000uF bulk capacitor is recommended for
the 1.8V VDD source supply.
– A 100uF bulk capacitor is recommended for
the 3.3V VDDQ source supply.
– Four sets of 0.1uF and 0.01uF high frequency
capacitors are recommended between VDD,
VDDQ and ground.
Multiple bulk and high frequency capacitors may
also be required. Users can determine the values
of such capacitors after computing, based on their
system and power supply environment. The de-
vice should achieve the search performance as
specified with the bypass capacitors.
This application note is a general guideline for
Search Engine Design. For more detailed informa-
tion, please refer to Intel Website for Appnote AP-
912, Pentium III Xeon Processor Power Distribu-
tion Guidelines. (http://support.intel.com/design/
pentiumiii/xeon/applnots/245095.htm).
Figure 45. Network Search Engine Power Distribution
VDDQ
Source
100µF
VDD
1000µF
VDDQ
Source
0.1µF
0.01µF
VDDQ
0.1µF
0.01µF
GND
0.1µF
0.01µF
VDDQ
0.1µF
0.01µF
VDD
AI04297
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