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SMS24 Datasheet(PDF) 5 Page - Semtech Corporation |
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SMS24 Datasheet(HTML) 5 Page - Semtech Corporation |
5 / 7 page 5 ã 2000 Semtech Corp. www.semtech.com PROTECTION PRODUCTS PROTECTION PRODUCTS SMS05 THRU SMS24 SMSxx Circuit Diagram Protection of Four Unidirectional Lines Device Connection for Protection of Four Data Lines The SMSxx is designed to protect up to four unidirec- tional data lines. The device is connected as follows: 1. Unidirectional protection of four I/O lines is achieved by connecting pins 1, 3, 4 and 6 to the data lines. Pin 2 and 5 are connected to ground. 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. 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 SMSxx near the input terminals or con- nectors to restrict transient coupling. l Minimize the path length between the SMSxx 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. Applications Information |
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