SEMTECH STF203-22 Technical data

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STF203-22

USB Upstream Port Filter& TVS

For EMI Filtering and ESD Protection

Description

The STF203-22 is a combination EMI filter and line
termination device with integrated TVS diodes for use
on upstream USB ports. It is constructed using a
proprietary technology that allows passive components
and TVS diodes to be integrated in the same package.
Each device will provide termination, filtering, and ESD
protection for one upstream USB port. The STF203­22 is an easily implemented solution for meeting the
requirements of revision 1.1 of the Universal Serial Bus
specification.

USB line termination is achieved with 22Ω series

resistors on both the D+ and D- USB lines. These
resistors preserve signal integrity by matching the cable

impedance to that of the differential driver. The 1.5kΩ

pull-up resistor completes the termination circuit on
each line. This resistor is required by the USB specifi­cation to identify the equipment as either a full-speed
(connected to D+ line) or low-speed (connected to D­line) device. The 47pF capacitors are used to bypass
high frequency energy to ground and for edge rate
control of the USB signals. Finally, the STF203-22
contains TVS diodes for ESD protection of both (D+ &
D-) data lines and the voltage bus (V
diodes provide effective suppression of ESD voltages
in excess of 15kV (air discharge) and 8kV (contact
discharge) per IEC 61000-4-2, level 4.
The small size and integrated feature of the STF203­22 minimizes required board space. The STF203-22 is
suitable for use in USB hubs, computers, peripherals,
and portable devices.

). The TVS

BUS

Features

u Bidirectional EMI/RFI filtering and line termination

with integrated ESD protection

u ESD protection for USB power (V

(D+ & D-) to IEC 61000-4-2 Level 4

) and data lines

BUS

u Filtering and termination for two USB data lines
u Series resistors for impedance matching
u Low TVS operating voltage (5.25V)
u Low leakage current
u Small SC70-6L package
u Solid-state technology

Mechanical Characteristics

u EIAJ SC70-6L package
u Molding compound flammability rating: UL 94V-0
u Marking : Marking Code
u Packaging : Tape and Reel per EIA 481

Applications

u USB Ports
u Portable electronics
u Cellular Handsets
u PDA
u Pagers
u Digital Cameras
u Peripherals
u Notebook, and Handheld Computers

Circuit Diagram

1

.

5

3

Revision 11/16/2001

Schematic & PIN Configuration

6

2

4

D (From Connector)

D (From Connector)

1

D (To IC)

D (To IC)

SC70-6L (Top View)

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Absolute Maximum Rating

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2 2001 Semtech Corp.

www.semtech.com

PROTECTION PRODUCTS

Typical Characteristics

STF203-22

ESD Clamping (8kV Contact)

Typical Insertion Loss

CH1 S21log MAG 3 dB/ REF 0 dB

ESD Clamping (15kV Air)

Analog Crosstalk (D+ to D-)

CH1 S21log MAG 20 dB/ REF 0 dB

PRm

START .030 000 MHz STOP 3 000.000 000 MHz

PRm

START .030 000 MHz STOP 3 000.000 000 MHz

3 2001 Semtech Corp.

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Applications Information

STF203-22

Device Connection

The STF203-22 is designed to provide termination, EMI
filtering and ESD protection for two USB I/O lines. The
equivalent circuit diagram is shown in Figure 1. The
device is connected as follows:

1.1.

1. Full-Speed Devices: For full-speed devices the

1.1.
pull-up resistor is connected to the D+ line. Route
the D+ line from the connector to pin 1 of the
STF203-22. Pin 6 is connected to the D+ line of
the IC. Route the D- line from the connector to pin

3. Pin 4 is connected to the D- line of the IC. Pin 5
is connected to the voltage supply line (V

). Pin 2

BUS

is connected to ground.

2.2.

2. Low-Speed Devices

2.2.

::

: For low speed devices the

::
pull-up resistor is connected to the D- line. Route
the D- line from the connector to pin 1 of the
STF203-22. Pin 6 is connected to the D- line of the
IC. Route the D+ line from the connector to pin 3.
Pin 4 is connected to the D+ line of the IC. Pin 5
is connected to the voltage supply line (V

). Pin 2

BUS

is connected to ground.

Figure 1 - STF203-22 Circuit Diagram

.

Figure 2 - STF203-22 Connection Diagram

(Full Speed Devices)

From Connector

1

STF203

-22

2

34

6

5

USB Port Design Considerations

The Universal Serial Bus (USB) specification requires
termination and filtering components for proper opera­tion. In addition, an open USB socket is vulnerable to
hazardous ESD discharges in excess of 15kV. These
discharges can occur on the data lines or the voltage
bus. The STF203-22 is an easily implemented solution
that is designed to meet the termination & EMI filter
requirements of the USB specification revision 1.1. It
also provides ESD protection to IEC 61000-4-2, level

4.

USB line termination is achieved with series resistors
on both the D+ and D- lines. These resistors preserve
signal integrity by matching the cable impedance to

that of the differential driver. A 1.5kΩ pull-up resistor

is used to identify an upstream port on either the D+
(full speed devices) or the D- (low speed devices) data
line. Capacitors are used to bypass high frequency
energy to ground and for edge rate control of the USB
signals. TVS diodes are added for ESD protection of
both (D+ & D-) data lines and the voltage bus (V

BUS

).
The STF203-22 integrates all of the components
necessary for line termination, bidirectional EMI filter­ing, and ESD protection on upstream ports. This

integrated solution simplifies design and requires
minimal board space.

Board Placement & Layout Guidelines.

Designing a USB hub to meet EMI & ESD immunity
requirements requires a combination of optimum
component placement, trace routing, and good circuit
design practices. Some general guidelines are given
below:

l Avoid running D+ & D- signal line traces near high

speed clock lines or similar signal lines.

l Avoid running critical signal lines near board edges.
l Locate the USB controller chip near the USB

connectors.

l Place the STF203-22 near the USB connector to

restrict transient coupling.

l Minimize the path length between the USB connec-

tor and the STF203-22

4 2001 Semtech Corp.

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PROTECTION PRODUCTS

Outline Drawing

STF203-22

Land Pattern

5 2001 Semtech Corp.

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PROTECTION PRODUCTS

Marking

322

123

Ordering Information

STF203-22

456

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Contact Information

Semtech Corporation

Protection Products Division

652 Mitchell Rd., Newbury Park, CA 91320

Phone: [phone] FAX [phone]

6 2001 Semtech Corp.

www.semtech.com