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SN74AHCT86PWR Datasheet(PDF) 10 Page - Texas Instruments |
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SN74AHCT86PWR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 30 page Vcc Unused Input Input Output Input Unused Input Output SN54AHCT86, SN74AHCT86 SCLS250N – OCTOBER 1995 – REVISED AUGUST 2014 www.ti.com Typical Application (continued) 10.2.3 Application Curves Figure 5. Up Translation 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 should 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, 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 1 μF are commonly used in parallel. The bypass capacitor should 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 should 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 should not be left unconnected because the undefined voltages at the outside connections result in undefined operational states. Specified in Figure 6 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 makes more sense or is more convenient. It is generally acceptable to float outputs unless the part is a transceiver. If the transceiver has an output enable pin, it will disable the outputs section of the part when asserted. This will not disable the input section of the IOs so they cannot float when disabled. 12.2 Layout Example Figure 6. Layout Diagram 10 Submit Documentation Feedback Copyright © 1995–2014, Texas Instruments Incorporated Product Folder Links: SN54AHCT86 SN74AHCT86 |
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