Pull up/ Pull down resistor - explained ( with calculation )

Guide to use Pull up and Pull down resistor in a digital circuit. Calculation of these resistor values explained with a digital logic gate. And the things to avoid while implementing your digital circuit design.

[bobfurgenbirg]

Assuming 100uA as in your example, you would use a 10K not a 40K.
You only want to drop 1V across the resistor, not 4.
Vcc - Vin / Iin. (5-4 / .0001)

Don't forget different values of current for sourcing vs sinking inputs.

[ec]

you are the best one who did explain the pull-up and down resistor

[decem_unosquattro]

Ah very good sir ! 😀 You are a great teacher! I watched a few videos before your video but I couldn't grasp the concept. Now I understand. 🇦🇺👋🏻🤔👍🏻 thank you sir.

[kaoshavoc]

This video needs a few million more views. Seriousy. Everyone else just says, pick a big one if you want to soft pull, and a small one for a hard pull. This gave us the reason, and the math, even though, as soon as you said it, I realized, I should have seen that before hand. But, you know, most people teach you these circuits with ideal circuits in mind, so I had never thought about the input making a voltage divider, because well, when most people teach you, they say that inputs take no current, or so little you can discount it.
While that is probably true most of the time, at least now I know how to properly pick a pull up/down resistor. You earned my subscription. I hope your channel does very well.

[AB-yutj]

Thank you, your voice and this video was lullaby for me and thank you, for keeping the music volume down so I can hear the important things you're talking about.

[swedishpsychopath]

This is the best explanation on youtube! Not only did you explain the problem - but also showed us how to calculate the different resistor values depending on the range of the expected logic level. Nicely done, Sir!

[anythingunderthesun]

Great explanation and easy to understand! Keep up the good work! Thanks! You need to lower the volume of the background music to 10% of your vocal though.

[PhG]

Great video/tutorial !! Thnxs for sharing ! Please turn the music a little softer for your next video.

[magiclay]

hello do i need pull resistor even if the signal input comes from another ic sending out clock signal...or just use the pull resistor when is a mechanical switch?

[rezanouri]

one of the best explanations, thank you... :) It 'll be even better if music was in low volume! Thank you again for this wonderful explanations.

[un-named]

You are a brilliant human being. This is by FAR the best electronics video explanation ive ever come across. Thank you very much!

[michaelmedioli]

Nice video you explain in a clear way the arguments thank you a thousand times👍

[ags-engineering]

Thank you ! This video explains the use and application of pull up / pull down resistor clearly.

[fajri]

Your video answer all my question about pull resistor...
Thx..

[tylerrussell]

I had to watch a few times (I'm slow at learning new things), but I finally got it. Thanks!

[meetpatel]

thanks sir for making this type of video it clears our fundamentals

[yanxiaosun]

good tutorial man! but at 3:54, why is 3V and 2.5V combination an undefined state? Isn't this a logic high in TTL? or does it mean that induced voltage could vary rapidly and lead to 0.8-2.0V zone voltage?

[omaralharran]

Thank you for explaining this topic in depth. :)

[shivar]

This will be the best video, if u have avoided playing bg music👍

[imanidioli]

If you have to choose a teacher for anything you need to know, choose an indian one ❤🌸