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STF203-22.TC Scheda tecnica(PDF) 4 Page - Semtech Corporation |
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STF203-22.TC Scheda tecnica(HTML) 4 Page - Semtech Corporation |
4 / 6 page 4 2006 Semtech Corp. www.semtech.com 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. 1. 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. 2. 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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