E142AHF Datasheet, PDF (13/19 Pages) Semtech Corporation – Per Pin timing Deskew w 4x2 Cross Point Switch

EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
Edge142
Prop Delay vs. Duty Cycle
The 142 shows very little change in propagation delay
vs. input duty cycle. The following three charts show
the variation in the prop delay of a rising edge and a
falling edge as the duty cycle is varied from 1% to 99%.
Since the input signal period is 100 ns, a 1% duty cycle
corresponds to a 1 ns positive input pulse. A 99% duty
cycle corresponds to a 1 ns negative input pulse.
The first chart shows the Motorola 10EL11 clock
spreader timing error for both the rising and falling edge.
This information is used as a reference to compare the
142 against.
The second and third charts show the 142 under identical
conditions. The data is broken out into one chart for the
rising edge and a separate chart for the falling edge. In
addition, the timing error is listed over the entire delay
range of the 142.
EL11 Clock Spreader Tpd vs. 1%-99% Duty Cycle
100
80
60
40
20
0
-20
-40
-60
-80
-100
0
10 20 30 40 50 60 70 80 90 100
Duty Cycle [%] (Period=100 ns)
Tpd+ Error
Tpd- Error
Edge 142 Tpd+ vs. 1%-99% Duty Cycle
REXT2=2.94K
100
80
60
40
20
0
-20
-40
-60
-80
-100
0 10 20 30 40 50 60 70 80 90 100
Duty Cycle [%] (Period=100 ns)
Tpd+ Error, +0.1V
Tpd+ Error, -0.1V
Tpd+ Error, -0.3V
Tpd+ Error, -0.7V
Tpd+ Error, -0.9V
Tpd+ Error, -1.1V
Tpd+ Error, -1.3V
Edge 142 Tpd- vs. 1%-99% Duty Cycle
REXT2=2.94K
100
80
60
40
20
0
-20
-40
-60
-80
-100
0 10 20 30 40 50 60 70 80 90 100
Duty Cycle [%] (Period=100 ns)
Tpd- Error, +0.1V
Tpd- Error, -0.1V
Tpd- Error, -0.3V
Tpd- Error, -0.7V
Tpd- Error, -0.9V
Tpd- Error, -1.1V
Tpd- Error, -1.3V
 2000 Semtech Corp.
13
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