LX7203-xx
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 1
WWW
.
Microse
m
i
.
CO
M
EMI Filter & ESD Protection for Up Stream USB
Ports
Copyright
2002
Rev. 1.0a, 2002-10-22
I N T E G R A T E D P R O D U C T S
D E S C R I P T I O N
The LX7203 is an integrated
Universal Serial Bus (USB) line
termination device with an EMI filter
and ESD protection diodes. This
device offers a cost effective and
compact solution for one USB
upstream port. The USB v1.1
specification requires line termination
resistors on both the D+ and D- lines.
These resistors ensure signal integrity
by matching the cable impedance to
that of the differential driver. The 1.5
k pull-up resistor identifies the
appropriate data line for full speed or
low speed operation.
The 47 pF capacitor completes the
high frequency filter and controls the
edge rate of the USB signals The
LX7203 protects both D+ and D- data
lines and the voltage bus from ESD.
The TVS protection diodes exceed the
requirements of IEC61000-4-2, level 4,
15kV (air discharge) and 8kV (contact
discharge).The integrated configuration
of the LX7203 minimizes board space
and allows for ideal placement near the
connector. The LX7203 is ideal for use
in USB hubs, peripherals and portable
appliances
IMPORTANT:
For the most current data, consult
MICROSEMI
's website: http://www.microsemi.com
P A C K A G E O R D E R I N F O
T
J
(
C)
SM
Plastic
6-Pin SC70
Package
Marking
Tape & Reel Quantity
(Reel Size)
-40 to 125
LX7203-15ISM
315
-40 to 125
LX7203-22ISM
322
3K (7inches)
Note: Append the letter "T" to the part number
For Tape & Reel Ordering
K E Y F E A T U R E S
Small SC70-6L Package
Bi-directional EMI/RFI low-pass
filter
Line termination with integrated
ESD protection
Low TVS operating voltage
(5.25V)
Low leakage current
Integrated single die construction
Crosses From Semtech STF203
A P P L I C A T I O N S
USB Ports
Peripherals
Computers and Printers
Mobile phones
Pagers and PDA's
Digital Cameras
B E N E F I T S
Filter response characterized up
to 6 GHz
<2dB insertion loss in the pass
band
>20dB attenuation in the 800-
900 MHz range
>12dB attenuation in the WLAN
frequencies of 2.4GHz and 5.0-
6.0 GHz
P R O D U C T H I G H L I G H T
Rs
Rs
D out
to IC
V
BUS
C
EDGE
1.5K
D in
from
connector
2
5
D in
from
connector
D out
to IC
C
EDGE
Circuit Diagram
1
6
5
4
3
2
V
BUS
D
IN
from
connector
D
OUT
to IC
GND
D
IN
from
connector
D
OUT
to IC
R
S
C
R
S
C
R
PU
?
Functional Schematic with PinOut
L
L
X
X
7
7
2
2
0
0
3
3
LX7203-xx
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
WWW
.
Microse
m
i
.
CO
M
EMI Filter & ESD Protection for Up Stream USB
Ports
Copyright
2002
Rev. 1.0a, 2002-10-22
I N T E G R A T E D P R O D U C T S
A B S O L U T E M A X I M U M R A T I N G S
Steady State Power ................................................................100mW
ESD Air Discharge per IEC61000-4-2.......................................16kV
ESD Contact Discharge per IEC61000-4-2................................10kV
Lead Soldering Temperature (10 Seconds) ............................. 260C
Operating Temperature ........................................... -40C to +125C
Storage Temperature Range .................................... -55C to +150C
Note: Exceeding these ratings could cause damage to the device. All voltages are
with respect to
Ground. Currents are positive into, negative out of specified
terminal
.
T H E R M A L D A T A
SM
Plastic 6-Pin SC70
THERMAL RESISTANCE
-
JUNCTION TO
C
ASE
,
JC
119
C/W
THERMAL RESISTANCE
-
JUNCTION TO
A
MBIENT
,
JA
122
C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
JA
).
The
JA
numbers are guidelines for the thermal performance of the device/pc-board
system. All of the above assume no ambient airflow.
P A C K A G E P I N O U T
V
BUS
D
IN
D
IN
D
OUT
D
OUT
GND
1
2
3
4
5
6
from
connector
from
connector
to IC
to IC
SM P
ACKAGE
(Top View)
F U N C T I O N A L P I N D E S C R I P T I O N
Name Description
VBUS Bus
Voltage
DIN Data
In
GND Ground
DOUT Data
Out
E L E C T R I C A L C H A R A C T E R I S T I C S
Unless otherwise specified, the following specifications apply over the operating ambient temperature -40
C
T
A
+125
C except where
otherwise noted.
LX7203
Parameter Symbol
Test
Conditions
Min Typ Max
Units
Stand-Off
Voltage
VR
WM
5.25 V
Breakdown
Voltage
V
BR
IR = 1mA
6
V
Leakage
Current
I
R
VRWM = 5.25V, T = 25C
1
A
Series Resistance (-15)
R
S
Each
Line
13.5 15 16.5
Series Resistance (-22)
R
S
Each Line
19.8
22
24.2
Temperature Coefficient of R
S
T
COEFF
Each
Line
200
ppm
Pull Up Resistance
R
PU
Each Line
1.35
1.5
1.65
K
Capacitor C
EDGE
Each Line
47
pF
Total Capacitance
C
TOT
Between I/O Pins and Ground, Each Device
VR = 0V, f = 1MHz
54 60 66 pF
E
E
L
L
E
E
C
C
T
T
R
R
I
I
C
C
A
A
L
L
S
S
LX7203-xx
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
WWW
.
Microse
m
i
.
CO
M
EMI Filter & ESD Protection for Up Stream USB
Ports
Copyright
2002
Rev. 1.0a, 2002-10-22
I N T E G R A T E D P R O D U C T S
A P P L I C A T I O N C I R C U I T S
USB
Transceiver
Host or Hub (downstream port)
Peripheral (upstream port)
USB
Transceiver
1
6
5
4
3
2
V
BUS
GND
C
R
S
R
PD
R
PD
R
S
C
1
6
5
4
3
2
V
BUS
GND
R
S
C
R
S
C
R
PU
LX7203
LX7201
Figure 1
Typical Application
A P P L I C A T I O N I N F O R M A T I O N
The LX7203 meets the requirements of the USB v1.1
specification for device termination, EMI filtering and ESD
protection. The R
S
resistor provides the proper signal
termination; the C
EDGE
capacitor controls the signal rise and
fall slew; the TVS diodes protect the IC from ESD damage;
and the total capacitance and resistance creates a low pass
filter eliminating the high frequency energy from the circuit.
The LX7203 can configure the upstream port for either Full-
Speed or Low-Speed operation. The figures below show the
proper connection in accordance with the USB v1.1
specification.
F
ULL
S
PEED
D
EVICE
(F
IGURE
2)
The USB specification offers a 12 Mbps data transfer
rate known as Full-Speed which requires a 1.5 k pull-up
resistor to be connected to the D+ line. Slew rate control
is accomplished with C
EDGE
attached to the transceiver
before the R
S
.
Voltage Supply (Vbus) is connected to Pin 5
Ground is connected to Pin 2
D+ from the connector is routed to Pin 1 (1.5 k pull-up
resistor) and Pin 6 to the D+ line of the USB
Transceiver
D- from the connector is routed to Pin 3 and Pin 4 to
the D- line of the USB Transceiver
cable
Host
USB
Transceiver
GND
D+
D-
V
BUS
Peripheral
USB
Transceiver
GND
D+
D-
V
BUS
R
PU
1
6
5
4
3
2
V
BUS
D
IN
from connector
D
OUT
to IC
GND
D
IN
from connector
D
OUT
to IC
LX7203
Figure 2
Connection for Full Speed Operation
A
A
P
P
P
P
L
L
I
I
C
C
A
A
T
T
I
I
O
O
N
N
S
S
LX7203-xx
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 4
WWW
.
Microse
m
i
.
CO
M
EMI Filter & ESD Protection for Up Stream USB
Ports
Copyright
2002
Rev. 1.0a, 2002-10-22
I N T E G R A T E D P R O D U C T S
A P P L I C A T I O N I N F O R M A T I O N ( C O N T I N U E D )
L
OW
S
PEED
D
EVICE
(
FIGURE
3)
The USB specification offers a 1.5 Mbps data transfer
rate known as Low-Speed which requires a 1.5 k pull-up
resistor to be connected to the D- line. Slew rate control is
accomplished with C
EDGE
attached to the transceiver before
the R
S
.
Voltage Supply (Vbus) is connected to Pin 5
Ground is connected to Pin 2
D+ from the connector is routed to Pin 3 and Pin 4 to
the D+ line of the USB Transceiver
D- from the connector is routed to Pin 1 (1.5 k pull-up
resistor) and Pin 6 to the D- line of the USB Transceiver
cable
Host
USB
Transceiver
GND
D+
D-
V
BUS
Peripheral
USB
Transceiver
GND
D+
D-
V
BUS
R
PU
1
6
5
4
3
2
V
BUS
D
IN
from connector
D
OUT
to IC
GND
D
IN
from connector
D
OUT
to IC
LX7203
Figure 3
Connection for Low Speed Operation
ELECTROMAGNETIC EMISSION AND SUSCEPTABILITY
FCC Part 15 sets limits for maximum allowable EM
emission and susceptibility. There are two types of
emissions. Conducted emissions with frequency of
emission of 0.45 to 30 MHz and radiated emissions with
frequency of emission of 30 MHz to 40 GHz. All digital
computing devices including the peripheral devices must
comply. Examples of peripheral devices include terminals,
printers, external floppy disk drives and other data storage
devices, video monitors, keyboards, control cards, interface
boards, external memory expansion cards and other
input/output devices that may or may not contain digital
circuitry. LX7203 is optimized to minimize the radiated
EMI which is the primary concern in devices using USB.
Refer to the typical filter response curve for the attenuation
characteristics of LX7203 over the frequency range of
30kHz to 6GHz.
A
A
P
P
P
P
L
L
I
I
C
C
A
A
T
T
I
I
O
O
N
N
S
S
LX7203-xx
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 5
WWW
.
Microse
m
i
.
CO
M
EMI Filter & ESD Protection for Up Stream USB
Ports
Copyright
2002
Rev. 1.0a, 2002-10-22
I N T E G R A T E D P R O D U C T S
C H A R A C T E R I S T I C C U R V E S
8KV Contact ESD
5.0V
40.0ns
M
Figure 4
8KV ESD input pulse as per IEC61000-4-2.
Vertical scale is equivalent to 5A/div.
5.0V
40.0ns
M
Ch1
1
Figure 5
Clamping Characteristics when device
subjected to an 8 KV ESD pulse.
Figure 6
Frequency response curve. Low insertion loss in
the pass band and -20dB attenuation at 800-900 MHz.
Better than -10dB attenuation at the WLAN frequencies of
2.4 and 5.0-6.0 GHz.
Figure 7
Analog Crosstalk between the two datalines D-
and D+
G
G
R
R
A
A
P
P
H
H
S
S
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