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SN74AHCT245PWR Arkusz danych(PDF) 10 Page - Texas Instruments

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Numer części SN74AHCT245PWR
Szczegółowy opis  SNx4AHCT245 Octal Bus Transceivers With 3-State Outputs
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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SN74AHCT245PWR Arkusz danych(HTML) 10 Page - Texas Instruments

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Vcc
Unused Input
Input
Output
Input
Unused Input
Output
Output
Input
SN54AHCT245, SN74AHCT245
SCLS233P – OCTOBER 1995 – REVISED JULY 2014
www.ti.com
Typical Application (continued)
10.2.3 Application Curves
Figure 5. Typical Application Curve
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, 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 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 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 should not
be left unconnected because the undefined voltages at the outside connections result in undefined
operational states. Figure 6 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 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 output section of the part when asserted. This will not disable the input section of the
I/Os, so they cannot float when disabled.
12.2 Layout Example
Figure 6. Layout Diagram
10
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