PI6C3991-5IJ datasheet(10/11 Pages) PERICOM

Part #	PI6C3991-5IJ

Description	3.3V High-Speed, Low-Voltage Programmable Skew Clock Buffer SuperClock

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Manufacturer	PERICOM [Pericom Semiconductor Corporation]

Direct Link	http://www.pericom.com

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10

PS8450B

04/09/01

PI6C3991

3.3V High-Speed, Low-Voltage Programmable

Skew Clock Buffer - SuperClock®

Figure8.Board-to-BoardClockDistribution

Figure 8 shows the PI6C3991 connected in series to construct a zero

skew clock distribution tree between boards. Delays of the down

stream clock buffers can be programmed to compensate for the wire

length (i.e., select negative skew equal to the wire delay) necessary

to connect them to the master clock source, approximating a zero-

FB

REF

FS

4F0

4F1

3F0

3F1

2F0

2F1

1F0

1F1

TEST

4Q0

4Q1

3Q0

3Q1

2Q0

2Q1

1Q0

1Q1

System

Clock

REF

LOAD

Z0

FB

REF

FS

4F0

4F1

3F0

3F1

2F0

2F1

1F0

1F1

TEST

4Q0

4Q1

3Q0

3Q1

2Q0

2Q1

1Q0

1Q1

LOAD

Z0

LOAD

Z0

L1

L2

L3

L4

delay clock tree. Cascaded clock buffers will accumulate low-fre-

quency jitter because of the non-ideal filtering characteristics of the

PLLfilter.Itisrecommendedthatnotmorethantwoclockbuffersbe

connected in series.

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Manufacturer	Part #	Datasheet	Description
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PI6C3991-5IJ Datasheet(PDF) 10 Page - Pericom Semiconductor Corporation

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