Latches and Flip-Flops 2 - The Gated SR Latch

This is the second in a series of computer science videos about latches and flip-flops. These bi-stable combinations of logic gates form the basis of computer memory, counters, shift registers, and more. In particular, this video covers the gated set-reset latch. It begins by reviewing the ungated SR latch, including the risk of making both inputs high at the same time, and then goes on to show how SR latches that were built using NOR gates, and SR latches that were built using NAND gates, can be modified to make gated SR latches. Timing diagrams are also introduced, as a means of describing the behaviour of a latch. The videos that follow this one build upon the principles covered here and include the gated D latch, edge triggered pulse latches and the master slave D type flip-flop.

[@CroLover543]

What my professor fails to explain in 90 minutes, you DESTROY IT in 9, splendid work!

[@MrSzautner]

Top notch videos for a student just getting into these kinds of electronics. Thank you very much!

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You're better at explaining this than my University lecturer. And I'm paying 9 grand for him!!!

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9 grand my goodness, what university do you attend?

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@@DeadFishRocks All UK universities have fees of 9 grand, it's ridiculous

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[@MrVampiGames]

You deserve more subscribers and attention for your videos, your explanations are clear and makes the topic easier to grasp. Thank you for your effort, please keep doing videos about Computer Science & Electrical Engineering related concepts, you are really good at it (you earned a subscriber).

[@abc71277]

My professor is such a mess. Totally incomprehensible lecture. I was getting scared. Thank goodness I found this video.

[@ComputerScienceLessons]

Poor chap. Perhaps he should subscribe.

[@naftilos76]

Even though i have been working as an electronics engineer, i rarely see people doing electronics videos worth watching. This is definitely one of them. "Excelent" is the least i could say!

[@ComputerScienceLessons]

Thank you so much :)KD

[@stever3886]

Clearly a superior lecture. The pace is perfect, content perfect, graphics perfect, organized perfectly. You left nothing unsaid or open-ended. I have learned a ton from this.

[@joseblua6566]

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[@jonathan3976]

Love how you always give real life examples of everything. Thank you so much for these videos.

[@barankaplan4308]

THIS IS PURE TEACHING ABILITY!

[@jonka1]

Perfectly and elegantly explained thank you. The timing diagrams are now perfectly understood.

[@endubiz3880]

You have done so much effort to explain this topic well, and you did well , thank you very much .

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[@ComputerScienceLessons]

As I gaze into the crepuscular firmament and ruminate the astuteness of your promulgation, I am inclined to assume a state of acquiescence, nay, harmonious accord, as I expound my own limitless gratitude to you are yours. :)KD

[@richardwilliamjohnson8566]

very good thorough practical explanations. very much appreciated!

[@CanopusInfinity]

This video is amazing. Thank you, and I love the way you present every topic clearly and concisely.

[@ComputerScienceLessons]

Thank YOU :)KD

[@mitchwilliams2552]

Excellent explanation, thank you.

[@masterd2020]

Well done sir, you made my day. I can stress how this has helped me, I have gone through many textbook on this topic, but it seems confusing to me, Thanks once again for this great explanations.

[@TriNguyen-dl9uu]

holy hell, the explanation is so simple and easy to understand. 100 times better than my professor. Thank you so much!!!

[@ComputerScienceLessons]

You are most welcome :)KD

[@evanjalinm856]

U don't know how much u've helped me to visualise the concept ..... thank you so much sir

[@ComputerScienceLessons]

You are very welcome. Delighted to help :)KD

[@E4E]

Again, colourful and excellent

[@milovalle483]

Great Video series, super clear, gives nothing for granted!!!

[@ComputerScienceLessons]

You're most welcome :)KD

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I love you man

[@brandoncontreras343]

Thank you, your videos are amazing- CS Student

[@kanenaskanenou]

This channel is saving my life and my career

[@ComputerScienceLessons]

Glad to be of service :)KD

[@Lizini]

I love you dude, im in tears right now because you explained it so well compared to the books

[@ComputerScienceLessons]

You are most welcome :)KD

[@self-righteousjudgementalw8545]

Top notch and constitutional. Top notch

[@Seleya-llap1701]

Thank you so much for these Videos. They helpt me so much.

[@moutonguerrier]

high quality presentation, thanks!

[@ComputerScienceLessons]

Thank you for the comment. :)KD

[@bribillz8286]

When S goes high, Q goes low😅😅

[@ComputerScienceLessons]

and I'll be in Scotland before yee :)KD

[@jask320]

One of the best videos on this topic 👏

[@ComputerScienceLessons]

Thank you :)KD

[@pokerface550]

brilliant

[@LostInLeiden]

your videos are superb! Many thanks

[@ComputerScienceLessons]

You're very welcome :)KD

[@alibehrouz9833]

great man

[@MrXenon-hn7ju]

My professor is a fucking idiot, you are literally a god to me.

[@francofazzolari7973]

This is beautiful

[@ComputerScienceLessons]

Thank you :)KD

[@Sheeeeshack]

You are amazing

[@gustav_max]

more like the goated SR latch

[@ComputerScienceLessons]

:)KD

[@francescopiazza4882]

Very good teaching !

[@ComputerScienceLessons]

Thank you :)KD

[@metobom]

Well explained. Thanks a lot.

[@ComputerScienceLessons]

You're welcome. :) KD

[@user-ii1nu7rv2m]

Really helpful vedio

[@pmanolak]

Perfect video as usual!! Its worth to add also the JK flip-flip with Pr-Cr inputs!!

[@ComputerScienceLessons]

Than you. I will cover the JP flip flip eventually :)KD

[@pmanolak]

@@ComputerScienceLessons thanks a lot mate

[@Evi19Black]

Eine gute Zusammenfassung

[@mahmoudzewail4385]

are latches constructed with NOR and NAND gates tend to remain in the latched condition due to synchronous operation feature?

[@kelvinbyabato]

good and simplified.

[@ComputerScienceLessons]

thank you :)KD

[@yperskeptomenos]

Thank you so much!

[@ComputerScienceLessons]

You are very welcome :)KD

[@brian-lord]

Hear! Hear! to all the other comments. Totally agree!

[@ComputerScienceLessons]

Thank you - and thanks for commenting :)KD

[@rengokuhasira6069]

thank you for the video now my concept is clear

[@ComputerScienceLessons]

Glad to help. :)KD

[@a.alsuleim4609]

Hello sir, can you send me the slides or can you tell me which tool is used for drawing the components/circuits

[@ycchian971]

very good ,thank for share the knowlodge

[@ComputerScienceLessons]

You're welcome :)KD

[@dinujaya_thamara_alphaKnight]

You are a beast well explained 💯💯💯🫶🏻🫶🏻🫶🏻🫶🏻

[@dadinggo]

You are my hero.

[@ComputerScienceLessons]

Thank you :)KD

[@danbilzerian2052]

Awesome video. So much better than UWE explaining it

[@ComputerScienceLessons]

Thanks. :) KD

[@yifeili1872]

Thanks so much, you're better than my professor

[@ComputerScienceLessons]

You are most welcome :)KD

[@yarenkaya7872]

Very nice video but how would you plot the graphs by interpreting the behavior of the circuit, sir? Thanks

[@Mars-tj9tu]

sir u are a life saver

[@ComputerScienceLessons]

You're very welcome :)KD

[@thegreenxeno9430]

A flip flop is like a pushbutton power switch. One button turns it on, a second button turns it off. Some boxes are made in europe and they put the buttons on the wrong side. A gate is like a power switch for the power switch.

[@ComputerScienceLessons]

I like it!

[@bidaarle]

From my understanding when both S and R are LOW(0,0) and the GATE is ENABLED, shouldn't the S-R latch "misbehave" ?

[@Gsmart_]

Keep going beast explain thanks you ❤

[@ComputerScienceLessons]

Thank you :)KD

[@respawn_time1208]

Hi, Great video. Tho i didn't understand why when E=0, R=1, Q still remains 1?

[@christiancompiles5549]

Abstraction is beautiful. Also, for college students who see this comment: what class are you taking that is prompting you to watch this material and what is your major?

[@theman83744]

tnx a lot

[@ComputerScienceLessons]

You're welcome

[@afiqhaiqal3706]

Hi can i ask at 8:34, why doesnt Q change? I dont understand… if the R is high, then Q should reset right?

[@ComputerScienceLessons]

Only if E (Enable) is high. E is basically a switch which must be high or the latch will not respond to any changes in S or R. :)KD

[@ElGalloRdgz]

genio

[@ComputerScienceLessons]

Thank you :)KD

[@Capital_TheMedical]

why dont you have a video of J-k flip flop.?

[@nikoloz91]

You sound like james veitch when he speaks on his stand-ups :D

[@ComputerScienceLessons]

I'll take that as a complement :) KD

[@diraneserges6076]

Hi Have a question how to write D lacht in Vhld language?

[@zeeshanyaseen7233]

WELL EXPLAINED :) ..... YOU ARE MY LAST HOPE IN THIS COURSE !!!

[@angelailieva9711]

Sir can I please ask you a question regarding this type of latch but a little different. Please I have no one else to ask and I need the answer.

[@angelailieva9711]

I emailed you the question and I'm hoping for your answer:)

[@bryannaoumbarakat4144]

fking legend

[@ComputerScienceLessons]

tnx m8 :)KD

[@obliviontv5039]

I'm really not understanding why at the end Q remained high despite E going Low and then R becoming 1

[@PanosPitsi]

when you press r you reset

[@geminezjoyce5986]

Can someone explain to me the truth table of this?

[@ComputerScienceLessons]

Truth tables for latches and flip flops can be a little odd. This link might help. www.allaboutcircuits.com/textbook/digital/chpt-10/the-gated-s-r-latch/ :)KD

[@geminezjoyce5986]

@@ComputerScienceLessons thanks❤️

[@DanilKarlos]

Great and clear explanation, thanks a lot for the effort. There is one thing: your next video in the playlist ( 3 ) is a private video and nobody is able to watch it. Is it a mistake? If yes, would be nice if you could remove it from the playlist, so nobody gets confused. You can check out the screenshot if you can't see what I mean: imgur.com/a/jfQekuK

[@ComputerScienceLessons]

I'll get rid of the private stuff immediately.

[@markherring3513]

i like the yellow line animation...it helps but im still not comprehending it all....im trying..i really am but man this stuff is confusing!

[@ComputerScienceLessons]

I recommend that you review the basics on logic gates and truth tables first (see my playlist on logic gates). Take your time. Good luck. :)KD

[@markherring3513]

@@ComputerScienceLessons i do...i have all kinds of books...and IC bible showing all the ic;s and truths tables. I have zero schooling on this. I am trying to learn it on my own.

[@donquic]

would have been better if the paths was exp;ained