SCAN921023SLCX National Semiconductor, SCAN921023SLCX Datasheet - Page 17

• Manufacturer Part Number: SCAN921023SLCX
• Description: IC SERIALIZER 10BIT 49-FBGA
• Manufacturer: National Semiconductor
• Series: SCANr

Specifications of SCAN921023SLCX

• Function: Serializer
• Data Rate: 660Mbps
• Input Type: LVDS
• Output Type: LVDS
• Number Of Inputs: 10
• Number Of Outputs: 1
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 49-FBGA
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Application Information
USING T
QUALITY
The parameters t
eye pattern mask to validate signal quality in an actual
application or in simulation.
The parameter t
place data bits in the ideal position to be sampled by the
receiver. The typical t
the crossing point of the Tx data is 80pS ahead of the ideal
crossing point. The t
specify the earliest and latest, repectively, time that a cross-
ing will occur relative to the ideal position.
DJIT
FIGURE 20. Using t
AND T
DJIT
DJIT
RNM
DJIT
and t
measures the transmitter’s ability to
DJIT(min)
TO VALIDATE SIGNAL
parameter of −80pS indicates that
RNM
can be used to generate an
and t
DJIT
DJIT(max)
and t
(Continued)
RNM
FIGURE 19. Failsafe Biasing Setup
parameters
to Generate an Eye Pattern Mask and Validate Signal Quality
17
The parameter t
much of the ideal bit the receiver needs to ensure correct
sampling. After determining this amount, what remains of the
ideal bit that is available for external sources of noise is
called t
mask within the eye opening.
The vertical limits of the mask are determined by the
SCAN921224 receiver input threshold of +/− 50mV.
Please refer to the eye mask pattern of Figure 20 for a
graphic representation of t
RNM
. It is the offset from t
RNM
20000127
is calculated by first measuring how
20000128
DJIT
and t
DJIT(min or max)
RNM
.
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