Bounce-Free Switches and Debouncer ICs

Your Number One Choice for High Quality Debounced Switches and Debouncer Integrated Circuits.


Polling is a Notorious Time Sink. It Does Nothing But Waste Time Waiting for an Event to Happen. The LogiSwitch Handshake Takes the Polling Out of Normally Polled Pushbutton Routines.

Bounce-Free Switch User Guide



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Bounce Free Switches and Debouncer ICs for High-Speed Electronics

Switch Debouncer ICs Original Classic Series

LS18-P Original Classic Series 3-Channel Debouncer IC in PDIP-8 package

The Classic Original Switch Contact Debouncer IC for Embedded Processors with 3 Channels

$3.29

LS18-S Original Classic Series 3-Channel Debouncer IC in SOIC-8 Package

The Classic Original Switch Contact Debouncer IC for Embedded Processors with 3 Channels

$2.99

LS19-P Original Classic Series 6-Channel Debouncer IC in PDIP-14 Package

The Classic Original Switch Contact Debouncer IC for Embedded Processors with 6 Channels

$3.59

LS19-S Original Classic Series 6-Channel Debouncer IC in SOIC-14 Package

The Classic Original Switch Contact Debouncer IC for Embedded Processors with 6 Channels

$3.39

LS20-P Original Classic Series 9-Channel Debouncer IC in PDIP-20 Package

The Classic Original Switch Contact Debouncer IC for Embedded Processors with 9 Channels

$4.79

LS20-S Original Classic Series 9-Channel Debouncer IC in SOIC-20 Package

The Classic Original Switch Contact Debouncer IC for Embedded Processors with 9 Channels

$3.99

Switch Debouncer ICs LS100 Series with Handshake

LS118-P (PDIP-8) 3-CHANNEL DEBOUNCER IC with HANDSHAKE

New Switch Interface for Embedded Processors - Essential for Interrupt Driven or Polled Environments

$3.65

LS118-S (150 mil SOIC-8) 3-CHANNEL DEBOUNCER IC with HANDSHAKE

Three Channel Switch Debouncer with Handshake SOIC-8 150 mil Package

$3.40

LS119-S (150 mil SOIC-14) 6-CHANNEL DEBOUNCER IC with HANDSHAKE

LS-119-S (150 mil SOIC-14) 6-CHANNEL DEBOUNCER IC with HANDSHAKE

$3.69

Bounce Free - Poll Free Pushbutton Switches with Handshake

LS-16MM-R 16mm IP67 Vandal-Resistant Switch with Red Ring LED

Attractive panel-mount metal digital switch. IP67 rated - Water resistant and tamper/vandal proof.

$11.79

LS-16MM-G 16mm IP67 Vandal-Resistant Switch with Green Ring LED

Attractive panel-mount metal digital switch. Water resistant and tamper/vandal proof.

$11.79

LS-16MM-O: 16mm IP67 Vandal-Resistant Switch with Orange Ring LED

Attractive panel-mount metal digital switch. Water resistant and tamper/vandal proof.

$11.79

LS-16MM-Y: 16mm IP67 Vandal-Resistant Switch with Yellow Ring LED

Attractive panel-mount metal digital switch. Water resistant and tamper/vandal proof.

$11.79

LS-19MM-R 19mm IP67 Vandal-Resistant Switch with Red Ring LED

Attractive panel-mount metal digital switch. Water resistant and tamper/vandal proof.

$12.29

LS-19MM-G 19mm IP67 Vandal-Resistant Switch with Green Ring LED

Attractive panel-mount metal digital switch. Water resistant and tamper/vandal proof.

$12.29

LS-19MM-O 19mm IP67 Vandal-Resistant Switch with Orange Ring LED

Attractive panel-mount metal digital switch. Water resistant and tamper/vandal proof.

$12.29

LS-19MM-Y 19mm IP67 Vandal-Resistant Switch with Yellow Ring LED

Attractive panel-mount metal digital switch. Water resistant and tamper/vandal proof.

$12.29

LS-22MM-R 22mm IP67 Vandal-Resistant Switch with Red Ring LED

Attractive panel-mount metal digital switch. Water resistant and tamper/vandal proof.

$15.39

LS-22MM-G 22mm IP67 Vandal-Resistant Switch with Green Ring LED

Attractive panel-mount metal digital switch. Water resistant and tamper/vandal proof.

$15.39

LS-6MM-R 6mm Bounce Free Switch with Handshake and Red Cap

Small 6mm Digital Panel Mount Switch.

$4.59

LS-6MM-G 6mm Bounce Free Switch with Handshake and Green Cap

Small 6mm Bounce Free Panel Mount Switch

$4.59

LS-6MM-B 6mm Bounce Free Switch with Handshake and Black Cap

Small 6mm Bounce Free Panel Mount Switch

$4.59

Bounce Free - Poll Free Subminiature Limit Switches with Handshake

LS-KW10-NL SubMicro Bounce Free Limit Switch - No Lever

Micro-miniature Digital Limit Switches for Superior High Speed Fully Debounced Performance

$4.59

LS-KW10-SL SubMicro Bounce Free Limit Switch with Short Lever

Micro-miniature Digital Limit Switches for Superior High Speed Fully Debounced Performance

$4.59

LS-KW10-LL SubMicro Bounce Free Limit Switch - Long Lever

Micro-miniature Digital Limit Switches for Superior High Speed Fully Debounced Performance

$4.59

LS-KW10-AL SubMicro Bounce Free Limit Switch - Arc Lever

Micro-miniature Digital Limit Switches for Superior High Speed Fully Debounced Performance

$4.59

LS-KW10-RL SubMicro Bounce Free Limit Switch - Roller Lever

Micro-miniature Digital Limit Switches for Superior High Speed Fully Debounced Performance

$4.59

LS100 Series IC with Handshake User Guide


About Us



                                                    No Bouncing, No Polling, No Kidding!

Goodbye Switch Bounce

LogiSwitch was founded by Mike Pelkey, whose experience goes all the way back to the dawn of the microprocessor. In fact, Mike was the lead engineer for the first microprocessor-based product in the numerical control industry of the day -- a Z-axis controller called the Micro-Z.


Mike also developed the world’s first networked cash register in the mid-1970s, and he founded Macrotech International Corporation, which was a major manufacturer of board-level computer products in the late-1970s and early-1980s.


Throughout more than 40 years of designing digital systems, Mike -- like almost every other hardware designer engineer on the planet -- was plagued by the switch bounce problem. Having employed every version of traditional hardware-based and software-based switch bounce mitigation techniques (see our 
Switch Bounce/Debounce Tutorial), Mike decided that there had to be a better way.


The result of Mike's cogitations and ruminations was the LogiSwitch concept. Boasting adaptive bounce detection algorithms and a unique 1-wire handshaking protocol (see 
LS100 Series Debouncer ICs), low-cost LogiSwitch ICs reflect the state-of-the-art in switch bounce mitigation technology.

 

Technical Details


Bounce Free Switches and Debouncer ICs for High-Speed Electronics

LS-16MM Technical Details

16MM Digital Panel Mount Pushbutton Switch with LED Ring

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LS-19MM Technical Details

19MM Digital Panel Mount Pushbutton Switch with LED Ring

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LS-6MM Technical Details

Small Digital Panel Mount Pushbutton Switch

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LS-KW10 Technical Details

Micro-Miniature Digital Limit Switches

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LS-22MM Technical Details

22MM Digital Panel Mount Pushbutton Switch with LED Ring

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LED Wiring NOTES

Notes on wiring your LogiSwitch LED Ring

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LS100 Series ICs Technical Details

Multi-Channel Switch Debouncers with Handshake

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LS10 Classic Series ICs Technical Details

Multi-Channel Debouncer ICs

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Switch Bounce / Debounce Tutorial


Bounce Free Switches and Debouncer ICs for High-Speed Electronics

THE FIVE BASIC METHODS FOR ELIMINATING SWITCH CONTACT BOUNCE

This tutorial is to demonstrate all five methods for debouncing switches using single pole-single throw, or single pole-double throw switches. The guide includes the two methods for single pole-double throw (SPDT) switches which require no output delay and the two best methods for interfacing with the more simple single pole-single throw (SPST) switches.

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METHOD 1: SIMPLE TWO-PIN DEBOUNCE

METHOD 1: SIMPLE TWO-PIN DEBOUNCE

If you can spare two pins, this is the way to go. Using a SPDT switch, Pin 1 Low indicates the switch is inactive, and Pin 2 Low indicates it is activated.

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METHOD 2: CROSS-COUPLED NAND DEBOUNCE

METHOD 2: CROSS-COUPLED NAND DEBOUNCE

The cross-coupled nand gate method is ideal for projects where two processor pins are not available for use with one switch.

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METHOD 3: D-TYPE FLIP-FLOP DEBOUNCE

METHOD 3: D-TYPE FLIP-FLOP DEBOUNCE

Using the internal cross-coupled nand gating of a D-Type Flip flop provides an excellent Method 3 Debounce identical to Method 2. Note the Q output is normally high and goes low when the switch is activated.

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METHOD 4. HARDWARE DEBOUNCE FOR SPST SWITCHES.

METHOD 4. HARDWARE DEBOUNCE FOR SPST SWITCHES.

Whenever a single pole-single throw (SPST) switch is used for input into high-speed digital devices, the only thing you can do is to wait out the bounce interval with either hardware or software delays (see Waveform 2 below).

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METHOD 5. SOFTWARE DELAY DEBOUNCE

There are numerous examples online for software debounce routines for every computer language known to mankind. They all amount to simply waiting out the estimated bounce period.

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WAVEFORM 1. CROSS-COUPLED NAND AND 2-PIN DEBOUNCE METHODS.

WAVEFORM 1. CROSS-COUPLED NAND AND 2-PIN DEBOUNCE METHODS.

Note the immediate Q output. Methods 1 and 2 change the output state with no delay both on actuation and release.

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WAVEFORM 2. SPST AND SOFTWARE DELAY METHODS.

WAVEFORM 2. SPST AND SOFTWARE DELAY METHODS.

Note the delayed Q output for these methods. The Hardware Debounce circuit of Method 4 and Software Debounce of Method 5 require delaying action until the bounce time is through.

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Polling vs. Interrupt Driven


LS10 Classic Series IC User Guide


Questions or Comments


Bounce Free Switches and Debouncer ICs for High-Speed Electronics

  • Las Vegas, Nevada, United States

Application Examples





Reference Articles and Reviews


NEW


The Embedded Muse Issue Number 353, July 2, 2018 by The Ganssle Group, Jack Ganssle: This Week's Cool Product  This Week's Cool Product

Excellent Tutorial on Switch Debouncing by Manoj Shenoy:   ElectroSome