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SN74AHC1G14DBVRE4 Folha de dados(PDF) 9 Page - Texas Instruments

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Nome de Peças SN74AHC1G14DBVRE4
Descrição Electrónicos  Single Schmitt-Trigger Inverter Gate
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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SN74AHC1G14
Physical Push
Button
Microprocessor
VCC
SN74AHC1G14
www.ti.com
SCLS321Q – MARCH 1996 – REVISED SEPTEMBER 2015
9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
Physically interactive interface elements like push buttons or rotary knobs offer simple and easy ways to interact
with an electronic system. Many of these physical interface elements often have issues with bouncing, or where
the physical conductive contact can connect and disconnect multiple times during a button push or release. This
bouncing can cause one or more faulty transient signals to be passed during this transitional period. These faulty
signals can be observed in many common applications, for example, a television remote with bouncing error can
adjust the TV channel multiple times despite the button being pushed only once. To mitigate these faulty signals,
we can use a Schmitt-trigger, or a device with hysteresis, to remove these faulty signals. Hysteresis allows a
device to remember its history, and in this case, the SN74AHC1G14 uses this memory to debounce the signal of
the physical element, or filter the faulty transient signals and pass only the valid signal each time the element is
used. In this example, we show a push-button signal passed through an SN74AHC1G14 that is debounced and
inverted to the microprocessor for push detection.
9.2 Typical Application
Figure 4. Switch Debouncer
9.2.1 Design Requirements
The SN74AHC1G14 device uses CMOS technology and has balanced output drive. Take care to avoid bus
contention because it can drive currents that would exceed maximum limits. The SN74AHC1G14 allows for
performing logical Boolean functions with hysteresis using digital signals. All input signals must remain as close
as possible to either 0 V or VCC for optimal operation.
Copyright © 1996–2015, Texas Instruments Incorporated
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