sy56572xr Micrel Semiconductor, sy56572xr Datasheet - Page 7

• Manufacturer Part Number: sy56572xr
• 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
50Ωto 1.2V, not 100Ω differentially across the outputs. If
AC coupling is used, Figure 5d, terminate into 50Ω 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 50Ω to 1.8V or 100Ω differentially across the
outputs. AC-or DC-coupling is fine. For best signal
integrity, terminate any unused output pairs.
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SY56572XR