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74LVC2G241DCTRE4 Fiches technique(PDF) 11 Page - Texas Instruments |
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74LVC2G241DCTRE4 Fiches technique(HTML) 11 Page - Texas Instruments |
11 / 24 page VCC Unused Input Input Output Output Input Unused Input Frequency - MHz 0 20 40 60 80 0 200 400 600 800 1000 1200 1400 1600 D001 Icc 1.8V Icc 2.5V Icc 3.3V Icc 5V SN74LVC2G241 www.ti.com SCES210O – APRIL 1999 – REVISED DECEMBER 2015 Typical Application (continued) 9.2.3 Application Curve Figure 5. ICC vs Frequency 10 Power Supply Recommendations The power supply can be any voltage between the minimum and maximum supply voltage rating located in Recommended Operating Conditions. Each VCC pin should have a good bypass capacitor to prevent power disturbance. For devices with a single supply, a 0.1- μF capacitor is recommended and if there are multiple VCC pins then a 0.01-μF or 0.022-μF capacitor is recommended for each power pin. It is ok to parallel multiple bypass capacitors to reject different frequencies of noise. 0.1- μF and 1-μF capacitors are commonly used in parallel. The bypass capacitor should be installed as close to the power pin as possible for best results. 11 Layout 11.1 Layout Guidelines When using multiple bit logic devices inputs must not ever float. In many cases, functions or parts of functions of digital logic devices are unused; for example, when only two inputs of a triple-input AND gate are used or only 3 of the 4 buffer gates are used. Such input pins must not be left unconnected because the undefined voltages at the outside connections result in undefined operational states. Specified below are the 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 make more sense or is more convenient. 11.2 Layout Example Figure 6. Layout Diagram Copyright © 1999–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: SN74LVC2G241 |
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