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SN74CB3Q3253DGVR Datasheet(PDF) 11 Page - Texas Instruments |
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SN74CB3Q3253DGVR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page 0 1 2 3 0 100 200 300 400 500 600 700 800 900 1000 Time (ps) VIN VOUT C001 SN74CB3Q3253 www.ti.com SCDS145B – OCTOBER 2003 – REVISED JUNE 2015 Typical Application (continued) as directed in Layout. 9.2.3 Application Curve Figure 6. Propagation Delay (tpd) Simulation Result at VCC = 2.5 V 10 Power Supply Recommendations The power supply can be any voltage between the minimum and maximum supply voltage rating listed in the Absolute Maximum Ratings table. Each VCC terminal should have a good bypass capacitor to prevent power disturbance. For devices with a single supply, a 0.1- μF bypass capacitor is recommended. If multiple pins are labeled VCC, then a 0.01-μF or 0.022-μF capacitor is recommended for each VCC because the VCC pins are tied together internally. For devices with dual- supply pins operating at different voltages, for example VCC and VDD, a 0.1-µF bypass capacitor is recommended for each supply pin. To reject different frequencies of noise, use multiple bypass capacitors in parallel. Capacitors with values of 0.1 μF and 1 μF are commonly used in parallel. The bypass capacitor should be installed as close to the power terminal as possible for best results. 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 7 shows progressively better techniques of rounding corners. Only the last example (BEST) maintains constant trace width and minimizes reflections. Copyright © 2003–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: SN74CB3Q3253 |
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