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SL24.TC 数据表(PDF) 5 Page - Semtech Corporation |
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SL24.TC 数据表(HTML) 5 Page - Semtech Corporation |
5 / 7 page 5 2004 Semtech Corp. www.semtech.com PROTECTION PRODUCTS PROTECTION PRODUCTS SL05 through SL24 SL Connection Options Device Connection for Protection of One High-Speed Data Line The SL series devices are designed to protect high- speed data lines. The SLxx utilizes a low capacitance compensation diode in series with, but in opposite polarity to a TVS diode in each line to achieve an effective capacitance of less than 5pF per device. During a transient event, the internal rectifier must be forward biased (TVS is reversed biased). Therefore, each device will only suppress transient events in one polarity. To achieve protection in both positive and negative polarity, a second device is connected in anti- parallel to the first. On unidirectional lines, a fast switching steering diode may be used as an alternative to using two SL devices. The options for connecting the devices are as follows: Low capacitance protection of one high-speed line: Protection of one unidirectional or bidirec- tional high-speed line is achieved by connecting two devices in anti-parallel. Pin 1 of the first device is connected to the line and pin 2 is connected to ground (or to a second line for differential protec- tion). Pin 2 of the second device is connected to line 1 and pin 1 is connected to ground (or line 2) as shown. Pin 3 is not connected. During positive duration transients, the first device will conduct from pin 1 to 2. The steering diode conducts in the forward direction while the TVS will avalanche and conduct in the reverse direction. During negative transients, the second device will conduct in the same manner. For optimum protection, the ground connections should be made directly to the ground plane for best results. The path length is kept as short as possible to reduce the effects of parasitic inductance in the board traces. The path length between the TVS and the protected line should also be minimized. Connection Option for Unidirectional Lines Only: An optional method for protecting unidirectional (normal signal polarities above ground) lines is to add a fast switching steering diode in parallel to the SL TVS. Input/outputs are connected to pin 1 of the SL device and the cathode of the rectifier. The anode of the diode and pin 2 of the SL TVS are connected to ground. Two Devices : Bidirectional or Unidirectional Line One Devices with Steering Diode : Unidirectional Line I/O Line Protection Applications Information 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. |
类似零件编号 - SL24.TC |
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类似说明 - SL24.TC |
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