dp83241 National Semiconductor Corporation, dp83241 Datasheet - Page 15

• Manufacturer Part Number: dp83241
• Description: Cdd Device Fddi Clock Distribution Device
• Manufacturer: National Semiconductor Corporation

5 0 Detailed Information
The most conservative method for routing the ECL signals
to multiple loads is to use the F100115 Quad Low Skew
Driver This device takes a differential ECL signal and out-
puts four of the same differential signals with a skew be-
tween them of less than 75 ps Two of these devices will
allow the CDD device to drive four PLAYER devices This
setup allows the ECL signals to be routed in a point to point
configuration to each PLAYER device
Parallel Termination
FIGURE 5-9 CDD Device Driving Four PLAYER Devices Using Two F100115 Quad Low Skew Drivers
FIGURE 5-8 Proper Bus Line Termination and Connections
(Continued)
15
As with any high speed signal the routing of the signal must
be carefully done Sharp corners and other changes in trace
impedance should be avoided to reduce reflections in high
speed signal traces Traces longer then one inch should
have a series or parallel termination scheme Further sys-
tem considerations can be found in National’s F100K De-
sign Guide If these methods are followed the DP83241 sig-
nals will be able to drive multiple DP83251 55 PLAYER de-
vices without any problems
TL F 10385 – 13
TL F 10385 – 14