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USB Upstream Port Filter and TVS For EMI Filtering and ESD Protection
PROTECTION PRODUCTS Description
The STF202 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 STF202 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 22 or 30 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 1.5k 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 STF202 contains TVS diodes for ESD protection of both (D+ and 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 STF202 minimizes required board space and increases system reliability. The STF202 is suitable for use in USB hubs, computers, peripherals, and portable devices.
STF202-22 and STF202-30
Features
Bidirectional EMI/RFI filtering and line termination with integrated ESD protection ESD protection for USB power (VBUS) 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 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 Portable electronics Cellular Handsets Modems Peripherals Servers, Desktop, Notebook, and Handheld Computers
Circuit Diagram
Schematic and PIN Configuration
.
S0T23-6L (Top View)
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STF202-22 and STF202-30
PROTECTION PRODUCTS Absolute Maximum Rating
Rating Steady-State Power ESD Air Discharge per IEC 61000-4-2 ESD Contact Discharge per IEC 61000-4-2 Lead Soldering Temperature Operating Temperature Storage Temperature Symbol Pp k VESD TL TJ TSTG Value 100 16 10 260 (10 sec.) -40 to +125 -55 to +150 Units mW kV C C C
Electrical Characteristics
STF202-xx Parameter T VS Reverse Stand-Off Voltage T VS Reverse Breakdown Voltage T VS Reverse Leakage Current Symbol VRWM V BR IR It = 1mA VRWM = 5.25V, T=25C Between VBUS pin and Ground VRWM = 3.3V, T=25C Between any data (D+, D-) pin and Ground. Between I/O pins and Ground, each device VR = 0V, f = 1MHz Each Line Each Line Each Line Each Line Between Input or Output and Ground and VBUS grounded VR = 0V, f = 1MHz 20 27 1.35 10 6 5 Conditions Minimum Typical Maximum 5.25 Units V V A
T VS Reverse Leakage Current
IR
1
A
T VS Junction Capacitance
Cj
pF
Series Resistance (STF202-22) Series Resistance (STF202-30) Pull Up Resistance Capacitor Total Capacitance
RS RS RUP C CTOT
22 30 1.5 47 60
24 33 1.65
k pF pF
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STF202-22 and STF202-30
PROTECTION PRODUCTS Typical Characteristics
ESD Clamping (8kV Contact) ESD Clamping (15kV Air)
Typical Insertion Loss
Analog Crosstalk (D+ to D-)
0 dB
0 dB -20 dB
-10 dB
-60 dB
-20 dB
0.030MHz
2.0GHz
0.030 MHz
1 GHz
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STF202-22 and STF202-30
PROTECTION PRODUCTS Applications Information
Device Connection 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 pullup resistor is connected to the D+ line. Pin 1 is connected to the voltage supply line (VBUS). 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. 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 (VBUS). 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 operation. 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. 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. 15k pull-down resistors are used to identify a downstream port while an upstream port is identified with a 1.5K pull up resistor 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+ and D-) data lines and the voltage bus (VBUS). A power distribution switch and voltage regulator provide the power management functions of the port.
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Figure 1 - STF202 Circuit Diagram
.
Figure 2 - STF202 Connection Diagram (Full Speed Devices)
1 2 3 6 5 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 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 specification. The SC5205 ULDO provides a stable voltage to the USB controller. Board Placement and Layout Guidelines. 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 connector and the STF202
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STF202-22 and STF202-30
PROTECTION PRODUCTS Applications Information
Figure 3 - USB Port Components
Figure 4 - Typical USB Hub Design
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STF202-22 and STF202-30
PROTECTION PRODUCTS Outline Drawing - SOT23 6L
A e1 N EI 1 ccc C 2X N/2 TIPS B 2 E D H GAGE PLANE 0.25 e DETAIL D aaa C A2 SEATING PLANE C A1 bxN bbb C A-B D A SEE DETAIL SIDE VIEW L (L1) H c
DIM
A A1 A2 b c D E1 E e e1 L L1 N 01 aaa bbb ccc
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.057 .035 .000 .006 .035 .045 .051 .010 .020 .003 .009 .110 .114 .118 .060 .063 .069 .110 BSC .037 BSC .075 BSC .012 .018 .024 (.024) 6 0 10 .004 .008 .008 1.45 0.90 0.00 0.15 .90 1.15 1.30 0.25 0.50 0.08 0.22 2.80 2.90 3.00 1.50 1.60 1.75 2.80 BSC 0.95 BSC 1.90 BSC 0.30 0.45 0.60 (0.60) 6 0 10 0.10 0.20 0.20
2X E/2
01
A
A
NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
Land Pattern -SOT23 6L
X
DIM
(C) G Y Z C G P X Y Z
DIMENSIONS MILLIMETERS INCHES
(.098) .055 .037 .024 .043 .141 (2.50) 1.40 0.95 0.60 1.10 3.60
P
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
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STF202-22 and STF202-30
PROTECTION PRODUCTS Marking Codes
Part Number STF202-22 STF202-30 Marking Code 222 230
Ordering Information
Part Number STF202-22.TC STF202-30.TC STF202-22.TCT STF202-30.TCT Lead Finish SnPb SnPb Pb free Pb free Qty per Reel 3,000 3,000 3,000 3,000 R eel Size 7 Inch 7 Inch 7 Inch 7 Inch
Contact Information
Semtech Corporation Protection Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
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