LXT974/LXT975 — Fast Ethernet 10/100 Quad Transceivers
3.3
Twisted-Pair/ RJ-45 Interface
Figure 20 shows layout of the LXT974 twisted-pair interface in a single-high RJ-45 modular
application. Figure 21 shows layout of the LXT975 twisted-pair interface in a dual-high (stacked)
RJ-45 application.
Figure 20. Typical LXT974 Twisted-Pair Single RJ-45 Modular Application
LXT974
Port 3
Port 2
Port 1
Port 0
Termination
resistors and
common mode
bypass capacitors
are not shown.
See "Layout
Requirements"
section for
recommended
application circuit.
20
19 18 17 16 15
14 13 12 11 10
9
8 7
6
5
4
3
2
1
Tx
Rx
Tx
Rx
Rx
Tx
Rx
Tx
33 34
21
25 26
28 29
30 31
35 36
38 39
40
23 24
RJ-45
Footprint
2
4
6
8
2
1
4
6
8
7
2
4
6
5
8
2
4
6
8
1
3
5
7
3
5
1
3
7
1
3
5
7
Edge of PCB
1
8
1
8
1
8
1
8
Port 3
Port 2
Port 1
Port 0
Single
RJ-45
Amphenol
557571-1
1X4 Port Single Modular Jack
44
Datasheet
INTEL [ INTEL ]
