STF203-15.TCT datasheet(4/6 Pages) SEMTECH

部品番号	STF203-15.TCT

部品情報	USB Upstream Port Filter and TVS

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 2006 Semtech Corp.

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PROTECTION PRODUCTS

STF203-15 THRU STF203-33

Device Connection

The STF203 is designed to provide termination, EMI

filtering and ESD protection for one USB port. The

device is connected as follows:

1.

1. Full-Speed Devices: For full-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. 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

BUS). Pin 2 is

connected to ground. Note that the input and

output connections may be reversed if necessary

(See Figure 3).

2.

2. Low-Speed Devices::::: 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. 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

BUS). Pin 2 is

connected to ground. Note that the input and

output connections may be reversed if necessary

(See Figure 4).

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 STF203 is an easily implemented solution

that is 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.

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 1.5k

Ω 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 for EMI suppression. TVS

diodes provide ESD protection of both (D+ and D-)

data lines and the voltage bus (V

BUS). The STF203

integrates all of these components in a small SC-70

package. This integrated solution simplifies design and

requires minimal board space.

Figure 1 - Preferred Connection Diagram

(Full Speed Devices)

Applications Information

Figure 2 - Preferred Connection Diagram

(Low Speed Devices)

1

2

34

5

6

STF203

From Connector

1

2

34

5

6

STF203

From Connector

Figure 4 - Alternate Connection Diagram

(Low Speed Devices)

Figure 3 - Alternate Connection Diagram

(Full Speed Devices)

1

2

34

5

6

STF203

From Connector

1

2

34

5

6

STF203

From Connector

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