sy56028xr Micrel Semiconductor, sy56028xr Datasheet - Page 7

• Manufacturer Part Number: sy56028xr
• Description: Low Voltage 1.2v/1.8v/2.5v Cml 4 1 Mux With 1 2 Fanout 6.4gbps With Equalization
• Manufacturer: Micrel Semiconductor

Micrel, Inc.
Functional Description
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 with VCCO
at 1.2V needs to be terminated, do not leave floating.
Timing Diagrams
April 2010
(Qx state can be high or low depending on input data)
Figure 1b. SEL-to-Q Timing Diagram
Figure 1a. IN-to-Q Timing Diagram
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CML Output Termination with VCCO 1.8V, 2.5V
For VCCO of 1.8V or 2.5V, Figure 5a/b, terminate with
either 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.
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SY56028XR