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SN74AHC1G08DBVTG4 Datasheet(PDF) 10 Page - Texas Instruments |
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SN74AHC1G08DBVTG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 23 page 10 SN74AHC1G08 SCLS314P – MARCH 1996 – REVISED MARCH 2016 www.ti.com Product Folder Links: SN74AHC1G08 Submit Documentation Feedback Copyright © 1996–2016, Texas Instruments Incorporated Typical Application (continued) 9.2.3 Application Curves Figure 5. AHC Family VOH vs IOH at VCC = 5.5 V Figure 6. AHC Family VOL vs IOL at VCC = 5.5 V 10 Power Supply Recommendations The power supply can be any voltage between the minimum and maximum supply voltage rating listed in the Recommended Operating Conditions table. Each VCC terminal should have a bypass capacitor to prevent power disturbance. A 0.1-μF bypass capacitor is recommended for devices with a single supply. 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. Use multiple bypass capacitors in parallel to reject different frequencies of noise. 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. |
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