ICS951464 datasheet(20/25 Pages) RENESAS

20 / 25 page

IDTTM/ICSTM

Programmable System Clock Chip for ATI RS/RD690 K8TM - based Systems

1211B—09/17/09

ICS951464

IDTTM/ICSTM Programmable System Clock Chip for ATI RS/RD690 K8

TM - based Systems

SRC Routing Information

SRC Reference Clock

Common Recommendations for Differential Routing

Dimension or Value

Unit

Figure

L1 length, Route as non- coupled 50 ohm trace.

0.5 max

inch

2, 3

L2 length, Route as non- coupled 50 ohm trace.

0.2 max

inch

2, 3

L3 length, Route as non- coupled 50 ohm trace.

0.2 max

inch

2, 3

ohm

2, 3

49.9

ohm

2, 3

Down Device Differential Routing

Dimension or Value

Unit

Figure

L4 length, Route as coupled microstrip 100 ohm

differential trace.

2 min to 16 max

inch

L4 length, Route as coupled stripline 100 ohm

differential trace.

1.8 min to 14.4 max

inch

Differential Routing to PCI Express Connector

Dimension or Value

Unit

Figure

L4 length, Route as coupled microstrip 100 ohm

differential trace.

0.25 to 14 max

inch

L4 length, Route as coupled stripline 100 ohm

differential trace.

0.225 min to 12.6

max

inch

Fig.1

HSCL Output

Buffer

PCI Ex

REF_CLK

Test Load

L3’

L1’

L2’

L4’

Fig.2

HSCL Output

Buffer

PCI Ex Board

Down Device

REF_CLK Input

L3’

L1’

L2’

L4’

Fig.3

HSCL Output

Buffer

PCI Ex

Add In Board

REF_CLK Input

L3’

L1’

L2’

L4’

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