STF202-22_04 [SEMTECH]

USB Upstream Port Filter and TVS; USB上行端口过滤器和电视


型号：	STF202-22_04
厂家：	SEMTECH CORPORATION
描述：	USB Upstream Port Filter and TVS USB上行端口过滤器和电视过滤器电视
文件：	总7页 (文件大小：178K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

STF202-22 and STF202-30

USB Upstream Port Filter and TVS

For EMI Filtering and ESD Protection

PROTECTION PRODUCTS

Features

Description

The STF202 is a combination EMI filter and line termi-

nation device with integrated TVS diodes for use on

upstream USB ports. It is constructed using a propri-

etary 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 STF202 is

an easily implemented solution for meeting the require-

ments of revision 1.1 of the Universal Serial Bus

specification.

Bidirectional EMI/RFI filtering and line termination

with integrated ESD protection

ESD protection for USB power (V_BUS) and data lines

(D+ and D-) to

IEC 61000-4-2 (ESD) ±15kV (air), ±8kV (contact)

IEC 61000-4-4 (EFT) 40A (5/50ns)

Filtering and termination for two USB data lines

Different series resistors for impedance matching

Low TVS operating voltage (5.25V)

Low leakage current

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 1.5kΩ

pull-up resistor completes the termination circuit on

each line. This resistor is required by the USB specifi-

cation to identify the equipment as either a full-speed

(connected to D+ line) or low-speed (connected to D-

line) device. The 47pF capacitors are used to bypass

high frequency energy to ground and for edge rate

control of the USB signals. Finally, the STF202 con-

tains TVS diodes for ESD protection of both

Low capacitance

Solid-state technology

Mechanical Characteristics

EIAJ SOT23 6L package

Molding compound flammability rating: UL 94V-0

Marking : Marking Code

Packaging : Tape and Reel per EIA 481

Applications

USB Hubs

(D+ and D-) data lines and the voltage bus (V_BUS). 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 STF202

minimizes required board space and increases system

reliability. The STF202 is suitable for use in USB hubs,

computers, peripherals, and portable devices.

Portable electronics

Cellular Handsets

Modems

Peripherals

Servers, Desktop, Notebook, and Handheld

Computers

Circuit Diagram

Schematic and PIN Configuration

S0T23-6L (Top View)

www.semtech.com

Revision 08/11/04

STF202-22 and STF202-30

PROTECTION PRODUCTS

Absolute Maximum Rating

Rating

Symbol

Value

Units

Steady-State Power

P_pk

100

ESD Air Discharge per IEC 61000-4-2

ESD Contact Discharge per IEC 61000-4-2

V_ESD

Lead Soldering Temperature

Operating Temperature

Storage Temperature

T_L

T_J

260 (10 sec.)

-40 to +125

-55 to +150

°C

T_STG

Electrical Characteristics

STF202-xx

Parameter

Symbol

Conditions

Minimum

Typical

Maximum

Units

TVS Reverse Stand-Off Voltage

TVS Reverse Breakdown Voltage

TVS Reverse Leakage Current

V_RWM

V_BR

I_R

5.25

I_t= 1mA

V_RWM= 5.25V, T=25°C

Between V_BUSpin and

Ground

µA

TVS Reverse Leakage Current

TVS Junction Capacitance

I_R

V_RWM= 3.3V, T=25°C

Between any data

(D+, D-) pin and Ground.

µA

C_j

Between I/O pins and

Ground, each device

V_R= 0V, f = 1MHz

Series Resistance (STF202-22)

Series Resistance (STF202-30)

Pull Up Resistance

R_S

Each Line

1.5

Ω

R_UP

1.35

1.65

kΩ

Capacitor

Total Capacitance

C_TOT

Between Input or

Output and Ground and

V_BUSgrounded

V_R= 0V, f = 1MHz

www.semtech.com

2004 Semtech Corp.

STF202-22 and STF202-30

PROTECTION PRODUCTS

Typical Characteristics

ESD Clamping (15kV Air)

ESD Clamping (8kV Contact)

Typical Insertion Loss

Analog Crosstalk (D+ to D-)

0 dB

-20 dB

-10 dB

-20 dB

-60 dB

0.030MHz

2.0GHz

0.030 MHz

1 GHz

www.semtech.com

2004 Semtech Corp.

STF202-22 and STF202-30

PROTECTION PRODUCTS

Applications Information

Device Connection

Figure 1 - STF202 Circuit Diagram

The STF202 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 . Full-Speed Devices: For full-speed devices the pull-

up resistor is connected to the D+ line. Pin 1 is

connected to the voltage supply line (V_BUS). The

input of the D+ line is routed into pin 3 and out of

pin 4. The input of the D- line is connected at pin 2

and the output at pin 5. Pin 6 is connected to

ground.

Figure 2 - STF202 Connection Diagram

(Full Speed Devices)

2 . Low-Speed Devices: For low speed devices the

pull-up resistor is connected to the D- line. Pins 1

is connected to the voltage supply line (V_BUS). The

input of the D- line is connected at pin 3 with the

output taken at pin 4. The input of the D+ line is

connected to pin 2 and the output is at pin 5. Pin

6 is connected to ground.

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 may occur on the data lines or the

voltage bus. The STF202 is an easily implemented

solution designed to meet the termination and EMI

filter requirements of the USB specification revision

1.1. It also provides ESD protection to IEC 61000-4-2,

level 4.

Semtech provides a complete solution to simplify USB

port design (Figure 4). The STF201 and STF202

integrate all of the components necessary for line

termination, bidirectional EMI filtering, and ESD protec-

tion 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 specification. The SC5205 ULDO provides a

stable voltage to the USB controller.

Board Placement and Layout Guidelines.

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+ and D-) data lines and the

voltage bus (V_BUS). A power distribution switch and

voltage regulator provide the power management

functions of the port.

Designing a USB hub to meet EMI and ESD immunity

requirements requires a combination of optimum

component placement, trace routing, and good circuit

design practices. Some general guidelines are given

below:

Avoid running D+ and D- signal line traces near high

speed clock lines or similar signal lines.

Avoid running critical signal lines near board edges.

Locate the USB controller chip near the USB

connectors.

Place the STF202 near the USB connector to

restrict transient coupling.

Minimize the path length between the USB connec-

tor and the STF202

www.semtech.com

2004 Semtech Corp.

STF202-22 and STF202-30

PROTECTION PRODUCTS

Applications Information

Figure 3 - USB Port Components

Figure 4 - Typical USB Hub Design

www.semtech.com

2004 Semtech Corp.

STF202-22 and STF202-30

PROTECTION PRODUCTS

Outline Drawing - SOT23 6L

DIMENSIONS

INCHES

MILLIMETERS

DIM

MIN NOM MAX MIN NOM MAX

.057

.006 0.00

1.45

0.15

0.90

.035

2X E/2

A1 .000

A2 .035 .045 .051 .90 1.15 1.30

GAGE

.010

.003

.020 0.25

.009 0.08

0.50

0.22

PLANE

ccc C

.110 .114 .118 2.80 2.90 3.00

.060 .063 .069 1.50 1.60 1.75

0.25

2X N/2 TIPS

.110 BSC

.037 BSC

.075 BSC

2.80 BSC

0.95 BSC

1.90 BSC

(L1)

DETAIL A

.012 .018 .024 0.30 0.45 0.60

(.024)

(0.60)

0°

10°

0°

10°

aaa C

aaa

.004

.008

0.10

0.20

bbb

ccc

SEATING

PLANE

SEE DETAIL A

SIDE VIEW

bxN

bbb

C A-B D

NOTES:

1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).

2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE-H-

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

OR GATE BURRS.

Land Pattern -SOT23 6L

DIMENSIONS

DIM

INCHES

MILLIMETERS

(.098)

.055

.037

.024

.043

.141

(2.50)

1.40

0.95

0.60

1.10

3.60

(C)

NOTES:

1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.

CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR

COMPANY'S MANUFACTURING GUIDELINES ARE MET.

www.semtech.com

2004 Semtech Corp.

STF202-22 and STF202-30

PROTECTION PRODUCTS

Marking Codes

Marking

Part Number

Code

STF202-22

STF202-30

222

230

Ordering Information

Qty per

Reel

Part Number

Lead Finish

Reel Size

STF202-22.TC

STF202-30.TC

STF202-22.TCT

STF202-30.TCT

SnPb

3,000

7 Inch

Pb free

Contact Information

Semtech Corporation

Protection Products Division

200 Flynn Road, Camarillo, CA 93012

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

www.semtech.com

2004 Semtech Corp.

STF202-22_04 [SEMTECH]

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