NB2305A
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5
Zero Delay and Skew Control
All outputs should be uniformly loaded to achieve Zero
Delay between input and output. Since the CLKOUT pin is
the internal feedback to the PLL, its relative loading can
adjust the input−output delay.
For applications requiring zero input−output delay, all
outputs, including CLKOUT, must be equally loaded. Even
if CLKOUT is not used, it must have a capacitive load equal
to that on other outputs, for obtaining zero−input−output
delay.
SWITCHING WAVEFORMS
Figure 3. Duty Cycle Timing
1.4 V 1.4 V 1.4 V
t
1
t
2
Figure 4. All Outputs Rise/Fall Time
t
3
OUTPUT
2.0 V
0.8 V
t
4
2.0 V
0.8 V
3.3 V
0 V
1.4 V
1.4 V
t
5
Figure 5. Output − Output Skew
OUTPUT
OUTPUT
t
6
INPUT
OUTPUT
Figure 6. Input − Output Propagation Delay
V
DD
2
V
DD
2
Figure 7. Device − Device Skew
t
7
CLKOUT, Device 1
V
DD
2
V
DD
2
CLKOUT, Device 2
