8413S12 Datasheet, PDF (21/33 Pages) Integrated Device Technology – Selectable external crystal or differential

8413S12 DATA SHEET
Recommended Termination
Figure 4A 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 50 impedance single-ended or 100
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 4A. Recommended Source Termination (where the driver and receiver will be on separate PCBs)
Figure 4B 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 0 to 33. All traces should be 50
impedance single-ended or 100 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 4B. Recommended Termination (where a point-to-point connection can be used)
REVISION D 1/27/15
21
HCSL/ LVCMOS CLOCK GENERATOR