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SN74HC00DRE4 Folha de dados(PDF) 10 Page - Texas Instruments |
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SN74HC00DRE4 Folha de dados(HTML) 10 Page - Texas Instruments |
10 / 28 page Vcc Unused Input Input Output Input Unused Input Output 10 SN54HC00, SN74HC00 SCLS181F – DECEMBER 1982 – REVISED JULY 2016 www.ti.com Product Folder Links: SN54HC00 SN74HC00 Submit Documentation Feedback Copyright © 1982–2016, Texas Instruments Incorporated 10 Power Supply Recommendations The power supply can be any voltage between the MIN and MAX supply voltage rating located in Recommended Operating Conditions. Each VCC pin must have a good bypass capacitor to prevent power disturbance. For devices with a single supply, TI recommends a 0.1-µF bypass capacitor; if there are multiple VCC pins, then TI recommends 0.01-µF or 0.022-µF bypass capacitors for each power pin. It is acceptable to parallel multiple bypass capacitors 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. 11 Layout 11.1 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 5 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 are 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. 11.2 Layout Example Figure 5. Layout Diagram |
Nº de peça semelhante - SN74HC00DRE4 |
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Descrição semelhante - SN74HC00DRE4 |
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