sy56011r Micrel Semiconductor, sy56011r Datasheet - Page 7

• Manufacturer Part Number: sy56011r
• Description: Low Voltage 1.2v/1.8v/2.5v Cml 1 2 Fanout Buffer 6.4gbps With Equalization
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
Interface Applications
For Input Interface Applications see Figures 4a-e and
for CML Output Termination, see Figures 5a-d.
CML Output Termination with VCCO 1.2V
For VCCO of 1.2V, Figure 5a, terminate the output
with 50 Ohms to 1.2V, not 100 ohms differentially
across the outputs. If AC-coupling is used, Figure 5d,
terminate into 50 ohms to 1.2V before the coupling
capacitor and then connect to a high value resistor to
a reference voltage. Any unused output pair needs to
be terminated, do not leave floating.
Timing Diagrams
July 2008
Figure 1. Propagation Delay
CML Output Termination with VCCO 1.8V
For VCCO of 1.8V, Figure 5a and Figure 5b,
terminate either with 50 ohms to 1.8V or 100 ohms
differentially across the outputs. AC- or DC-coupling
is fine. For best signal integrity, terminate any unused
output pairs.
Input Termination
1.8V CML driver: Terminate input with VT tied to 1.8V.
Don’t terminate 100 ohms differentially.
2.5V CML driver: Terminate input with either VT tied
to 2.5V or 100 ohms differentially.
The input cannot be DC-coupled from a 1.2V CML
driver.
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SY56011R