DS90UB903QSQ/NOPB National Semiconductor, DS90UB903QSQ/NOPB Datasheet - Page 37

• Manufacturer Part Number: DS90UB903QSQ/NOPB
• Description: IC SER/DESER 10-43MHZ 18B 40LLP
• Manufacturer: National Semiconductor

Specifications of DS90UB903QSQ/NOPB

• Function: Serializer
• Data Rate: 900Mbps
• Input Type: LVCMOS
• Output Type: CML
• Number Of Inputs: 1
• Number Of Outputs: 1
• Voltage - Supply: 1.71 V ~ 1.89 V, 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 40-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

INTERCONNECT GUIDELINES
See AN-1108 and AN-905 for full details.
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Use 100Ω coupled differential pairs
Use the S/2S/3S rule in spacings
– S = space between the pair
– 2S = space between pairs
– 3S = space to LVCMOS signal
Minimize the number of Vias
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Additional general guidance can be found in the LVDS
Owner’s Manual - available in PDF format from the National
web site at: www.national.com/lvds
Use differential connectors when operating above
500Mbps line speed
Maintain balance of the traces
Minimize skew within the pair
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