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SN74LVC07AD 数据表(PDF) 13 Page - Texas Instruments |
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SN74LVC07AD 数据表(HTML) 13 Page - Texas Instruments |
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13 / 30 page ![]() Vcc Unused Input Input Output Input Unused Input Output VCC - V 0 20 40 60 80 0 200 400 600 800 1000 1200 1400 1600 D003 ICC 1.8 V ICC 2.5 V ICC 3.3 V ICC 5 V SN74LVC07A www.ti.com SCAS595V – OCTOBER 1997 – REVISED MAY 2015 Typical Application (continued) 10.2.3 Application Curves Figure 8. ICC vs Frequency 11 Power Supply Recommendations The power supply can be any voltage between the MIN and MAX supply voltage rating located in the Recommended Operating Conditions table. Each VCC pin must have a good bypass capacitor to prevent power disturbance. For devices with a single supply, 0.1 μf is recommended; if there are multiple VCC pins, then 0.01 μf or 0.022 μf is recommended for each power pin. It is acceptable to parallel multiple bypass caps to reject different frequencies of noise. A 0.1 μf and a 1 μf are commonly used in parallel. The bypass capacitor must be installed as close to the power pin as possible for best results. 12 Layout 12.1 Layout Guidelines When using multiple bit logic devices inputs must never 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. Figure 9 specifies 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 must 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. It is generally acceptable to float outputs, unless the part is a transceiver. 12.2 Layout Example Figure 9. Layout Diagram Copyright © 1997–2015, Texas Instruments Incorporated Submit Documentation Feedback 13 Product Folder Links: SN74LVC07A |
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