STF201-22.TC - SEMTECH - Datasheet.World

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1www.semtech.com

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STF201-22 & STF201-30

USB Downstream Port Filter & TVS

For EMI Filtering and ESD Protection

Description Features

Pin Configuration

Revision 08/11/04

The STF201 is a combination EMI filter and line termi-

nation device with integrated TVS diodes for use on

downstream 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 downstream USB port. The STF201

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 series 22Ω or

30Ω 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 15kΩ

pull-down resistors complete the termination circuit on

each line. They are required by the USB specification

to identify the line as a downstream connection. The

47pF capacitors are used to bypass high frequency

energy to ground and for edge rate control of the USB

signals. Finally, the STF201 contains TVS diodes for

ESD protection of both (D+ & D-) data lines and the

voltage bus (VBUS). The TVS 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 STF201

minimizes required board space and increases system

reliability. The pin-out of the device allows easy imple-

mentation. The STF201 is suitable for use in USB

hubs, computers, peripherals, and portable devices.

Applications

Mechanical Characteristics

USB Hubs

Portable electronics

Printers

Monitors

Servers, Desktop, and Notebook computers

Bidirectional EMI/RFI filtering and line termination

with integrated ESD protection

ESD protection for USB power (VBUS) and data lines

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

Filtering and termination for two USB data lines

Different series resistors for impedance matching

Low TVS operating voltage (5.25V)

Low leakage current

Low capacitance

Solid-state technology

EIAJ SOT23-6L package

Molding compound flammability rating: UL 94V-0

Marking : Marking Code

Packaging : Tape and Reel per EIA 481

S0T23-6L (Top View)

Circuit Diagram

2 2004 Semtech Corp. www.semtech.com

PROTECTION PRODUCTS

STF201-22 & STF201-30

Absolute Maximum Rating

Electrical Characteristics

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3 2004 Semtech Corp. www.semtech.com

PROTECTION PRODUCTS

STF201-22 & STF201-30

Typical Characteristics

ESD Clamping (8kV Contact)

Typical Insertion Loss

ESD Clamping (15kV Air)

0.030MH

2.0GH

0 dB

-10 dB

-20 dB

Analog Crosstalk (D+ to D-)

0.030 MH

1 GH

0 dB

-20 dB

-60 dB

4 2004 Semtech Corp. www.semtech.com

PROTECTION PRODUCTS

STF201-22 & STF201-30

Figure 1 - STF201 Functional Circuit Diagram

Device Connection

The STF201 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:

zUSB data lines are routed through the STF201 for

easy implementation and optimum pc board layout.

Pin 1 is connected to the voltage supply line. The

input of the D+ line is routed into pin 2 and out of

pin 5. The input of the D- line is connected at pin 3

and the output at pin 4. Pin 6 is connected to

ground. The ground connection should be made

directly to the ground plane for best results. The

path length is kept as short as possible to reduce

the effects of parasitic inductance in the board

traces.

USB Port Design Considerations

The Universal Serial Bus (USB) specification requires

termination and filtering components for proper opera-

tion. 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 STF201 is an easily implemented solution

designed to meet the termination & EMI filter require-

ments of the USB specification revision 1.1. It also

provides ESD protection to IEC 61000-4-2, level 4.

A simplified USB port is shown in Figure 3. 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. 15kΩ pull-down resistors are

used to identify a downstream port while an upstream

port is identified with a 1.5KΩ pull up resistor on either

the D+ (full speed devices) or the D- (low speed de-

vices) 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 (VBUS). A power distribution switch and voltage

regulator provide the power management functions of

the port.

Semtech provides a complete solution to simplify USB

port design (Figure 4). The STF201 & STF202 inte-

grate all of the components necessary for line termina-

Figure 2 - STF201 Connection Diagram

tion, bidirectional EMI filtering, and ESD protection on

downstream (STF201) or upstream (STF202) ports.

The SC5826 is a dual port power switch that provides

individual or ganged port switching, fault reporting, and

inrush current limiting as required by the USB specifica-

tion. The SC5205 ULDO provides a stable voltage to

the USB controller.

Board Placement & layout Guidelines.

Board layout and placement of the STF201 play a

critical role in EMI & ESD suppression. Designing a

USB hub to meet EMI & ESD immunity requirements

requires a combination of optimum component place-

ment, trace routing, and good circuit design practices.

Some general guidelines are given below:

zAvoid running D+ & D- signal line traces near high

speed clock lines or similar signal lines.

zAvoid running critical signal lines near board edges.

zLocate the USB controller chip physically near the

USB connectors.

zPlace the STF201 near the USB connector to

restrict transient coupling.

zMinimize the path length between the USB connec-

tor and the STF201 as well as between the USB

controller and the STF201.

Applications Information

5 2004 Semtech Corp. www.semtech.com

PROTECTION PRODUCTS

STF201-22 & STF201-30

Figure 3 - USB Port Components

Figure 4 - Typical USB Hub Design

Applications Information

6 2004 Semtech Corp. www.semtech.com

PROTECTION PRODUCTS

STF201-22 & STF201-30

Outline Drawing -

Land Pattern -

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DIMENSIONS

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DATUMS AND TO BE DETERMINED AT DATUM PLANE

CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).

DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS3.

OR GATE BURRS.

NOTES:

2. -A- -B- -H-

SIDE VIEW

THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.

CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR

COMPANY'S MANUFACTURING GUIDELINES ARE MET.

NOTES:

DIMENSIONS

INCHES

DIM

MILLIMETERS

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DIMENSIONS

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7 2004 Semtech Corp. www.semtech.com

PROTECTION PRODUCTS

STF201-22 & STF201-30

Marking Codes

Ordering Information

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22-102FTS221

03-102FTS031

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TCT.03-102FTSeerfbP000,3hcnI7

Contact Information

Semtech Corporation

Protection Products Division

200 Flynn Road, Camarillo, CA 93012

Phone: (805)498-2111 FAX (805)498-3804