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RCLAMP0503F.TCT Datasheet(PDF) 5 Page - Semtech Corporation |
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RCLAMP0503F.TCT Datasheet(HTML) 5 Page - Semtech Corporation |
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5 / 7 page  5 2005 Semtech Corp. www.semtech.com PROTECTION PRODUCTS RClamp0503F Device Connection Options for Protection of Three High-Speed Data Lines This device is designed to protect three data lines from transient over-voltages by clamping them to a fixed reference. When the voltage on the protected line exceeds the reference voltage (plus diode V F) the steering diodes are forward biased, conducting the transient current away from the sensitive circuitry. Data lines are connected at pins 1, 3, and 4. The negative reference is connected at pin 2. This pin should be connected directly to a ground plane on the board for best results. The path length is kept as short as possible to minimize parasitic inductance. Connect pin 5 directly to the positive supply rail (V CC). In this configuration the data lines are referenced to the supply voltage. The internal TVS diode prevents over-voltage on the supply rail. Protecting USB On-The-Go (OTG) Interfaces The USB OTG interface consists of the Data (D+ and D- ) lines, 5.25V voltage bus, and an ID pin. Since these pins are part of the connector, they are vulnerable to ESD and cable discharge events. The RClamp0503F is designed to protect all four USB OTG connections. The lines can be easily routed through the device as shown in the layout example. Matte Tin Lead Finish Matte tin has become the industry standard lead-free replacement for SnPb lead finishes. A matte tin finish is composed of 100% tin solder with large grains. Since the solder volume on the leads is small com- pared to the solder paste volume that is placed on the land pattern of the PCB, the reflow profile will be determined by the requirements of the solder paste. Therefore, these devices are compatible with both lead-free and SnPb assembly techniques. In addition, unlike other lead-free compositions, matte tin does not have any added alloys that can cause degradation of the solder joint. Data Line and Power Supply Protection Using Vcc as reference Applications Information USB On-The-Go Port Protection USB On-The-Go Port Layout Example |
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