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74LVC1G139DCURE4 데이터시트(PDF) 11 Page - Texas Instruments |
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74LVC1G139DCURE4 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 22 page VCC Unused Input Input Output Output Input Unused Input 0 1 2 3 4 5 6 7 8 9 0 5 10 15 20 25 30 35 40 Frequency (MHz) VCC=5V VCC=3.3V VCC=2.5V VCC=1.8V C001 SN74LVC1G139 www.ti.com SCES602D – AUGUST 2004 – REVISED AUGUST 2015 Typical Application (continued) 9.2.3 Application Curve Figure 5. ICC vs Frequency Load is 15 pF 10 Power Supply Recommendations The power supply can be any voltage between the minimum and maximum supply voltage rating located in Recommended Operating Conditions table. Each VCC terminal should have a good bypass capacitor to prevent power disturbance. For devices with a single supply, a 0.1- μF capacitor is recommended. If there are multiple VCC terminals then 0.01-μF or 0.022-μF capacitors are recommended for each power terminal. It is ok to parallel multiple bypass capacitors to reject different frequencies of noise. Multiple bypass capacitors may be paralleled to reject different frequencies of noise. The bypass capacitor should be installed as close to the power terminal as possible for the best results. 11 Layout 11.1 Layout Guidelines When using multiple bit logic devices, inputs should not float. In many cases, functions or parts of functions of digital logic devices are unused. Some examples are when only two inputs of a triple-input AND gate are used, or when only 3 of the 4-buffer gates are used. Such input pins should not be left unconnected because the undefined voltages at the outside connections result in undefined operational states. Specified in Figure 6 are rules that must be observed under all circumstances. All unused inputs of digital logic devices must be connected to a high or low bias to prevent them from floating. The logic level that should be applied to any particular unused input depends on the function of the device. Generally they will be tied to GND or VCC, whichever makes more sense or is more convenient. 11.2 Layout Example Figure 6. Layout Diagram Copyright © 2004–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: SN74LVC1G139 |
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