DS90C241IVSX/NOPB National Semiconductor, DS90C241IVSX/NOPB Datasheet - Page 19

• Manufacturer Part Number: DS90C241IVSX/NOPB
• Description: IC SERIAL/DESERIAL 24BIT 48-TQFP
• Manufacturer: National Semiconductor

Specifications of DS90C241IVSX/NOPB

• Function: Serializer/Deserializer
• Data Rate: 840Mbps
• Input Type: LVCMOS
• Output Type: LVDS
• Number Of Inputs: 1
• Number Of Outputs: 24
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 48-TQFP, 48-VQFP
• For Use With: SERDES24-35USB - BOARD EVALUATION DS90C241
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: DS90C241IVSX

lines help to ensure that coupled noise will appear as com-
mon-mode and thus is rejected by the receivers. The tightly
coupled lines will also radiate less.
Termination of the LVDS interconnect is required. For point-
to-point applications, termination should be located at both
ends of the devices. Nominal value is 100 Ohms to match the
line’s differential impedance. Place the resistor as close to the
transmitter DOUT± outputs and receiver RIN± inputs as pos-
sible to minimize the resulting stub between the termination
resistor and device.
LVDS 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
FIGURE 17. AC Coupled Application
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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
—S = space between the pair
—2S = space between pairs
—3S = space to LVCMOS/LVTTL signal
Minimize the number of VIA
Use differential connectors when operating above
500Mbps line speed
Maintain balance of the traces
Minimize skew within the pair
Terminate as close to the TX outputs and RX inputs as
possible
20171918
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