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SLYZ022 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce SLYZ022
Description  SNx4HC02 Quadruple 2-Input Positive-NOR Gates
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

SLYZ022 Fiches technique(HTML) 11 Page - Texas Instruments

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1.5
2
2.5
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3.5
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4.5
5
5.5
6
6.5
Supply Voltage (V)
C001
11
SN54HC02, SN74HC02
www.ti.com
SCLS076F – DECEMBER 1982 – REVISED APRIL 2015
Product Folder Links: SN54HC02 SN74HC02
Submit Documentation Feedback
Copyright © 1982–2015, Texas Instruments Incorporated
Typical Application (continued)
9.2.3 Application Curve
Figure 5. Typical Output Pulse Length Over VCC Range
10 Power Supply Recommendations
The power supply can be any voltage between the minimum and maximum 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, TI recommends a 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. Two bypass capacitors of value 0.1
μF and
1
μF are commonly used in parallel. For best results, install the bypass capacitor(s) as close to the power pin as
possible.
11 Layout
11.1 Layout Guidelines
When using multiple bit logic devices, inputs must 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 must not be left unconnected because the
undefined voltages at the outside connections result in undefined operational states. Specified in Absolute
Maximum Ratings 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 must 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 Recommendation


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