Nvidia Jetson TX2 Manual page 34

Parameter
GND Via Placement
Max # of vias
Via stub length
Voiding
AC cap pad voiding
Connector voiding (Required)
ESD
ESD protection device (Optional)
Max distance from ESD Device to Connector
Recommended ESD layout
Choke
Preferred device
Location - Max distance from to adjacent discontinuities – ex,
connector, AC cap)
Common-mode impe dance @ 100MHz
Max Rdc
Differential TDR impedance
Min Sdd21 @ 2.5GHz
Max Scc21 @ 2.5GHz
Serpentine
Min bend angle
Dimension
MIsc.
Routing over voids
Noise Coupling
Note: If routing to SATA device or SATA connector includes a flex or 2
for the max trace & skew calculations
JETSON TX2/TX2i OEM PRODUCT | DESIGN GUIDE | 20180618
Requirement
Place ground vias as symmetrically as possible to data pair vias
GND via distance should be placed less than 1x the diff pair via pitch
3
< 0.4
Voiding the plane directly under the pad 3-4 mils larger than the pad size is
recommended
The size of voiding can be same as the size of pin pad
Type: SEMTECH RClamp0524p. Place ESD component near connector.
A design may include the footprints for ESD as a stuffing option. The junction
capacitance in ESD may cause effect on signal integrity, so it's important to choose
an ESD component with low capacitance and whose package design is optimized
for high speed links. The SEMTECH ESD Rclamp0524p has been well verified with
its 0.3pF capacitance.
8 (53)
8 (53)
Min/Max 65/90
0.3
90
2.22
19.2
135
Min A Spacing 4x
Min B, C Length 1.5x
Min Jog Width 3x
Where signal pair approaches Vias, maximal trace length across void
on plane is 1.27mm
Keep critical SATA related traces such as SATA_TX/RX, SATA_TERM etc. away from
other signal traces or unrelated power traces/areas or power supply components
NVIDIA Jetson TX2/TX2i OEM Product Design Guide
Units Notes
If all are through-hole
mm
mm (ps)
Type: TDK ACM2012D-900-2P. Only if
needed. Place near connector. Refer to
Common Mode Choke Requirement
section.
mm (ps) TDK ACM2012D-900-2P
Ω
Ω
Ω @T -
R
200ps
(10%-90%)
dB
dB
deg (a) S1 must be
taken care in
Trace width
order to
consider Xtalk
to adjacent pair
nd
PCB, the total routing including all PCBs/flexes must be used
34