ICS557-01

PCI-EXPRESS GEN1 CLOCK SOURCE

PCIE

IDT® PCI-EXPRESS GEN1 CLOCK SOURCE

5

ICS557-01

REV P 072512

LVDS Compatible Layout Guidelines

Figure: LVDS Device Routing

Typical LVDS Waveform

Vdiff

Vp-p

Vcm

R1

R2

R3

R4

Note

0.45v

0.22v

1.08

33

150

100

100

0.58

0.28

0.6

33

78.7

137

100

0.80

0.40

0.6

33

78.7

none

100

ICS874003i-02 input compatible

0.60

0.3

1.2

33

174

140

100

Standard LVDS

R1a = R1b = R1

R2a = R2b = R2

Alternative T ermination for LVDS and other Common Differential Signals

HCSL Output Buffer

L1

L1'

R1b

L2

L2'

R1a

L4'

L4

L3

R2a

R2b

Down Device

REF_CLK Input

Figure 3

L3'

R3

R4

1150 mV

1250 mV

t

OR

t

OF

500 ps

500 ps

1325 mV

1000 mV

1150 mV

1250 mV