M7010R datasheet(63/67 Pages) STMICROELECTRONICS

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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

AI04297

GND

VDDQ

VDD

VDDQ

Source

VDDQ

Source

100µF

1000µF

0.1µF

0.01µF

0.1µF

0.01µF

0.1µF

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