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SN74AHCT16244DLG4 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 SN74AHCT16244DLG4
상세설명  16-Bit Buffers/Drivers With 3-State Outputs
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Vcc
Unused Input
Input
Output
Input
Unused Input
Output
Time (5 ns/div), V
= 5 V
CC
Output Voltage
Input Voltage
SN74AHCT16244
www.ti.com
SCLS334J – MARCH 1996 – REVISED OCTOBER 2014
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. 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.
12 Layout
12.1 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 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.
12.2 Layout Example
Figure 6. Layout Diagram
Copyright © 1996–2014, Texas Instruments Incorporated
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