8T49N287_16 Datasheet, PDF (61/75 Pages) Integrated Device Technology – FemtoClock NG Octal Universal Frequency Translator

8T49N287 Datasheet
2.5V and 3.3V HCSL Recommended Termination
Figure 11A is the recommended source termination for applications
where the driver and receiver will be on a separate PCBs. This
termination is the standard for PCI Express™ and HCSL output
types. All traces should be 50Ω impedance single-ended or 100Ω
differential.
0.5" Max
L1
Rs
22 to 33 +/-5%
0-0.2"
L2
L1
PCI Expres s
Driver
L2
0-0.2" L3
L3
1-14"
L4
L4
PCI Expres s
C o n n e cto r
0.5 - 3.5"
L5
L5
PCI Expres s
Add-in Card
Rt
49.9 +/- 5%
Figure 11A. Recommended Source Termination (where the driver and receiver will be on separate PCBs)
Figure 11B is the recommended termination for applications where a
point-to-point connection can be used. A point-to-point connection
contains both the driver and the receiver on the same PCB. With a
matched termination at the receiver, transmission-line reflections will
be minimized. In addition, a series resistor (Rs) at the driver offers
flexibility and can help dampen unwanted reflections. The optional
resistor can range from 0Ω to 33Ω. All traces should be 50Ω
impedance single-ended or 100Ω differential.
0.5" Max
L1
L1
PCI Expres s
Driver
Rs
0 to 33
0 to 33
0-18"
L2
L2
Rt
0-0.2"
L3
L3
49.9 +/- 5%
Figure 11B. Recommended Termination (where a point-to-point connection can be used)
©2016 Integrated Device Technology, Inc.
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Revision 7, October 27, 2016