High-Speed 10/100 Base-T Switching With the TS5L100 and TS3L100 LAN Switches

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R
E L I A B L E
. L
O G I C
. I
N N O V A T I O N
.
TM
High-Speed 10/100 Base-T Switching With the
TS5L100 and TS3L100 LAN Switches
The Texas Instruments (TI) TS5L100
and TS3L100 are local area network
(LAN) multiplexers from TI’s specialty
switch portfolio. They are specifically
designed to route 10/100 base-T
Ethernet signals. The major difference
between these two multiplexers is the
TS3L100 operates from a standard
3.3-V supply, and the TS5L100
operates from an easily implemented
6.2-V supply.
In the LAN application shown here,
the TS3L100 or TS5L100 is used to
switch the 10/100 base-T Ethernet
differential signals directly between
the docking station (through the
docking connector) and the laptop
computer. Mating the laptop to the
docking station flags a detection signal
to switch the TS3L100 or TS5L100
automatically to accept the differential
pair Ethernet signals from the dock-
ing station.
Prior mobile computing designs
entailed placing an Ethernet Media
Access Controller (MAC) and an
Ethernet Physical Layer (PHY)
device on the docking station. This
redundant circuitry unnecessarily
increased total system cost, as it can
be replaced quite efficiently with a
LAN switch from TI without sacrific-
ing signal quality.
Key Features
TS3L100
TS5L100
Benefits
r
on
flatness
4 Ωtyp.
(0 V < V
IN
< 3.3 V)
8 Ωtyp.
(0 V < V
IN
< 4.5 V)
Maintains good signal quality at
frequencies up to 350 MHz
∆r
on
1 Ωtyp.
1 Ωtyp.
Low skew between channels
High off-isolation
–42 dB typ.
–40 dB typ.
Excellent isolation at high
frequencies when LAN switch
is open
Low differential crosstalk
–55 dB typ.
–60 dB typ.
Excellent isolation between
channels to prevent unwanted
interference
Supply voltage range
3.0 to 3.6 V

Low-voltage operation

6.0 to 6.5 V*
Improved performance over
4.5-V input signal
Space-saving QFN package
Yes
Yes
Smallest ‘L100 LAN switch
available today
I
CC
3 µA max.
3 µA max.
Ideal for laptop computing
TI LAN Specialty Switches
*The TS5L100 requires a 6.2-V supply to provide a better on-resistance performance. 6.2 V can be generated by tapping off
between a 6-kΩresistor and a 6.2-V Zener (the other end of the resistor can be tied to the 12-V supply and the anode of the
Zener diode to ground).
Available in the small
space-saving QFN package!
3.5 mm
4.0
mm
0.5-mm
Pitch
Actual
Size
QFN

Docking Station
RX
TX
Notebook Motherboard
RX
2
2
Docking

Detection
RJ-45
Connector
10/100
Base-T
MAC + PHY
RX
TX
2
TS3L100
TS5L100
2
2
2
2
2
TX
RX
TX
RJ-45
Connector
Isolation
Magnetic
Isolation
Magnetic
Docking
Connector
High-Speed 10/100 Base-T Ethernet Switches Available From Texas Instruments
New TS specialty
switches from TI!
Basic 6.2-V Supply
12 V
6.2 V
6.2-V
Zener
6 kΩ
Typical Characteristics of the TS5L100
SCYB028
For More Information
Product Folders:
focus.ti.com/docs/prod/folders/
print/ts5l100.html
focus.ti.com/docs/prod/folders/
print/ts3l100.html
Datasheets:
focus.ti.com/lit/ds/symlink/
ts5l100.pdf
focus.ti.com/lit/ds/symlink/
ts3l100.pdf
Safe Harbor Statement
This publication contains forward-looking statements that involve a number of risks and uncertainties. These “forward-looking statements” are intended to qualify for the
safe harbor from liability established by the Private Securities Litigation Reform Act of 1995. These forward-looking statements generally can be identified by phrases
such as TI or its management “believes,” “expects,” “anticipates,” “foresees,” “forecasts,” “estimates” or other words or phrases of similar import. Similarly, such
statements herein that describe the company's products, business strategy, outlook, objectives, plans, intentions or goals also are forward-looking statements. All such
forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those in forward-looking statements.
Please refer to TI's most recent Form 10-K for more information on the risks and uncertainties that could materially affect future results of operations. We disclaim any
intention or obligation to update any forward-looking statements as a result of developments occurring after the date of this publication.
Reliable. Logic. Innovation.; and the red/black banner are trademarks of Texas Instruments.
© 2004 Texas Instruments Incorporated
YA
IA
0
IA
1
IB
0
IB
1
IC
0
IC
1
ID
0
ID
1
E
S
YC
YB
YD
4
7
9
12
2
3
5
6
11
10
14
13
15
1
Control
Logic
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1 10 100
Frequency (MHz)
Gain (dB)
–50
–45
–40
–35
–30
–25
–20
–15
–10
–5
0
Phase
Gain
Phase (Degrees)
Package*
Orderable
Part Number
Top-Side
Marking
JEDEC
TI
Carrier
QFN
RGY
Tape and reel
TS3L100RGYR
TK100
SOIC
D
Tube
TS3L100D
TS3L100
Tape and reel
TS3L100DR
SSOP (QSOP)
DBQ
Tape and reel
TS3L100DBQR
TK100
TSSOP
PW
Tube
TS3L100PW
TK100
Tape and reel
TS3L100PWR
TVSOP
DGV
Tape and reel
TS3L100DGVR
TK100
QFN
RGY
Tape and reel
TS5L100RGYR
TG100
SOIC
D
Tube
TS5L100D
TS5L100
Tape and reel
TS5L100DR
SSOP (QSOP)
DBQ
Tape and reel
TS5L100DBQR
TG100
TSSOP
PW
Tube
TS5L100PW
TG100
Tape and reel
TS5L100PWR
TVSOP
DGV
Tape and reel
TS5L100DGVR
TG100
*Package drawings, standard packing quantities, thermal data, symbolization and PCB design guidelines are
available at www.ti.com/sc/package
Ordering Information
TS5L100 Functional Diagram
Printed in the U.S.A by Texoma Business Forms, Colbert, OK
Printed on recycled paper.
0
5
10
15
20
25
30
35
40
45
50
10 2 3 4 5 6
0
1
2
3
4
5
6
Input Voltage, V
I
(V)
On-Resistance, r
on (Ω)
Output Voltage, VO (V)
r
on
V
O
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
1 10 100
Frequency (MHz)
Off Isolation (dB)
–250
–200
–150
–100
–50
0
50
100
150
200
250
Phase
Phase (Degrees)
Off Isolation
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
1 10 100
Frequency (MHz)
Crosstalk (dB)
0
50
100
150
200
250
Phase
Phase (Degrees)
Crosstalk
Gain/Phase vs. Frequency
Off-Isolation vs. Frequency
On-Resistance vs. Input Voltage
Crosstalk vs. Frequency