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SN74CBTLV3253DG4 Datasheet(PDF) 11 Page - Texas Instruments |
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SN74CBTLV3253DG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 27 page WORST BETTER BEST 1W min. W SN74CBTLV3253 www.ti.com SCDS039I – DECEMBER 1997 – REVISED SEPTEMBER 2015 11 Layout 11.1 Layout Guidelines Reflections and matching are closely related to the loop antenna theory but are different enough to be discussed separately from the theory. When a PCB trace turns a corner at a 90° angle, a reflection can occur. A reflection occurs primarily because of the change of width of the trace. At the apex of the turn, the trace width increases to 1.414 times the width. This increase upsets the transmission-line characteristics, especially the distributed capacitance and self–inductance of the trace which results in the reflection. Not all PCB traces can be straight and therefore some traces must turn corners. Figure 5 shows progressively better techniques of rounding corners. Only the last example (BEST) maintains constant trace width and minimizes reflections. 11.2 Layout Example Figure 5. Trace Example Copyright © 1997–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: SN74CBTLV3253 |
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