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SN74AHC1G14DCKRG4 Datasheet(PDF) 9 Page - Texas Instruments |
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SN74AHC1G14DCKRG4 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 23 page 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 Submit Documentation Feedback 9 Product Folder Links: SN74AHC1G14 |
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