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LCDA05.TB Datasheet(PDF) 5 Page - Semtech Corporation |
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LCDA05.TB Datasheet(HTML) 5 Page - Semtech Corporation |
5 / 8 page 5 2005 Semtech Corp. www.semtech.com PROTECTION PRODUCTS LCDA05 through LCDA24 Applications Information Device Connection for Protection of Two High-Speed Data Lines The LCDAxx is designed to protect up to two high-speed data lines. The LCDAxx utilizes a low capacitance compensation diode in series with, but in opposite polarity to a TVS diode in each line. The resulting capacitance is less than 5pF per line. Each line will only suppress transient events in one polarity. There- fore, to achieve protection in both positive and nega- tive polarity, a second TVS/rectifier pair is connected in anti-parallel to the first. Pins 1, 2, 7, and 8 are used to protect one data line. Pins 3, 4, 5, and 6 are used to protect the second data line. The device is connected as follows: Pins 1 and 2 are tied together and pins 7 and 8 are tied together providing the protection circuit for one I/O line. Pins 3 and 4 are tied together and pins 5 and 6 are tied together providing the protec- tion circuit for the second I/O line. Since the device is electrically symmetrical, either side of the connected pairs may be used to protect the lines. The other side of the pair is used to make the ground connection. The ground connections should be made directly to the ground plane for best results. The path length is kept as short as pos- sible to reduce the effects of parasitic inductance in the board traces. Circuit Board Layout Recommendations for Suppres- sion of ESD. Good circuit board layout is critical for the suppression of ESD induced transients. The following guidelines are recommended: Place the TVS near the input terminals or connec- tors to restrict transient coupling. Minimize the path length between the TVS and the protected line. Minimize all conductive loops including power and ground loops. The ESD transient return path to ground should be kept as short as possible. Never run critical signals near board edges. Use ground planes whenever possible. 1 2 3 45 6 7 8 Line 1 In/Out Line 1 Ground Line 2 In/Out Line 2 Ground From Connector To Protected Device 1 2 3 45 6 7 8 Line 1 In/Out Ground Line 2 In/Out From Connector To Protected Device Connection Options I/O Line Protection LCDA Connection Diagram I/O 1 I/O 2 I/O 1 I/O 2 1 2 3 45 6 7 8 |
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