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SN74AHC540PWR 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 SN74AHC540PWR
상세설명  Octal Buffers/Drivers
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Vcc
Unused Input
Input
Output
Input
Unused Input
Output
SN54AHC540, SN74AHC540
www.ti.com
SCLS260L – DECEMBER 1995 – REVISED OCTOBER 2015
Typical Application (continued)
9.2.3 Application Curve
Figure 5. Switching Characteristics Comparison
10 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 terminal 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 terminals
then 0.01
μF or 0.022 μF is recommended for each power terminal. 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 terminal as possible for 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 the 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. It is 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 I/Os so they also cannot float when disabled.
11.2 Layout Example
Figure 6. Layout Diagram
Copyright © 1995–2015, Texas Instruments Incorporated
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