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SMDA05CN-5 Datasheet(PDF) 4 Page - Semtech Corporation |
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SMDA05CN-5 Datasheet(HTML) 4 Page - Semtech Corporation |
4 / 6 page 4 ã 2000 Semtech Corp. www.semtech.com PROTECTION PRODUCTS PROTECTION PRODUCTS SMDA05CN-5 THRU SMDA15CN-5 Protection for Four Bidirectional Lines Protection for Five Bidirectional Lines Device Connection Options for Protection of Four or Five Data Lines The SMDAxxCN-5 can be configured to protect either four or five bidirectional data lines. The options for connecting the devices are as follows: 1. Bidirectional protection of four I/O lines is achieved by connecting pins 1, 2, 3, and 4 to the data lines. Pins 5, 6, 7, and 8 are connected to ground. The ground connection 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. In this configuration, the device can withstand the maxi- mum specified transient impulse on four lines simultaneously. 2. Bidirectional protection of five I/O lines is achieved by connecting pins 1, 2, 3, 4, and 5 to the data lines. Pins 6, 7, and 8 are connected to ground. The ground connection should be made directly to the circuit board ground plane for best results. In this configuration, the device can withstand the maximum rated transient impulse on any two lines simultaneously. 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: l Place the TVS near the input terminals or connec- tors to restrict transient coupling. l Minimize the path length between the TVS and the protected line. l Minimize all conductive loops including power and ground loops. l The ESD transient return path to ground should be kept as short as possible. l Never run critical signals near board edges. l Use ground planes whenever possible. From Connector To Protected IC From Connector To Protected IC Applications Information |
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