Basic IC's

[Mikebits]

The LMC555 is not a 555. It is a completely different chip that just happens to behave exactly like a 555. I am talking about a 555. A 555 is just a TTL chip.

It is exactly the same as all the TTL 7400 series. None of the 7400 are CMOS. But a 74cxxxx is a CMOS version of a TTL chip and performs an almost identical function but possibly not to the same high frequency of the TTL version, but consumes less current.


The original poster had a heading on this article: "555" This means just the 555 TTL timer chip.

He should have written "555 TTL timer and 7555 CMOS Timer."

Do you just like to argue, is that your thing? below is directly from the data sheet.

The LMC555 is a CMOS version of the industry standard
555 series general purpose timers.

You do speak English do you not?​

​

​

​

 

[colin55]

I wasn't really talking to you. I was asked to correct an article in a 555 document.

 

[Mikebits]

I wasn't really talking to you. I was asked to correct an article in a 555 document.

No, I think you did when you made this statement which was a response to one of my comments.

The LMC555 is not a 555. It is a completely different chip that just happens to behave exactly like a 555. I am talking about a 555. A 555 is just a TTL chip.

 

[ericgibbs]

I wasn't really talking to you. I was asked to correct an article in a 555 document.

This a open public forum, anyone can reply to a thread or post.

 

[Mikebits]

I think we need to return this topic to the poster...

 

[mark_3094]

I have made a circuit based on the 555 notes. It's just a simple 555 LED flasher, and I have included a description of how it works.

I'd be interested in anyone's opinion...

 

[colin55]

Some slight changes to 555 doc

555 Rev-1

 

[audioguru]

A 555 is not a TTL IC. Its supply voltage and output current are much different to TTL logic ICs.

An LMC555, TLC555 and ICM7555 are low current and lower voltage 555 timers.

 

[mark_3094]

Colin,
Why would pins 2 and 6 be swapped? I don't see the benefit of this?

 

[colin55]

Because pin 2 detects the lower value and pin 6 detects the higher value.

This is what I am trying to explain as a teacher.
I can "see" a circuit working and you have to gravitate to this condition.
That's why everything has to be in the correct position on a circuit diagram.
A circuit speaks immediately and anyone who provides a list of components and letters such as R1 R2 on a circuit diagram is not an engineer.
All my circuits speak immediately and all my projects can be built by the component overlay.
I introduced this to Australia over 25 years ago in my magazine when the other magazines in Australia still has no overlay on their boards and only a number such as "PXNVZE2" as the board identifier.
The USA was no better. They had projects in magazines with boards produced by the author from a jar of Ferric Chloride. No overlay, no tinning, no solder mask.

Secondly I am trying to correct your work in ONE GO.
This goes completely contrary to my normal writing where I take at least one month to prepare an article and I read it at least 10 times.
I realise you are learning but many of the sentences you write are completely different to anything I would have written because the absolute context of what you are writing is incorrect.
In additon I also note that you now put the diagram near the text. It's all things like this that show me how much oyu know and understand about the concepts of teaching and understanding electronics.
I have been a teacher for more than 30 years and sold over 750,000 books.
I only specialise in the beginning of electornics because that is the area very few peolple know how to get across.



Now someone is challenging the fact that the 555 is not TTL

A lot of the comments I am getting is like coming from “the back of the class,” from students that don’t have anything better to do that run around in circles.

TTL simply means Transistor Transistor Logic and just because some of the TTL chips run at a maximum of 5v does not mean anything else cannot be TTL composition.


The 555 is known and idetified as the TTL version. The other types are known for other reasons. That's why I brought up the point when you created the document "555."

 

[Mikebits]

The 555 is a mixed signal device with TTL compatible pins. It is not considered a TTL device due to it containing analog circuits.

 

[Mikebits]

Because pin 2 detects the lower value and pin 6 detects the higher value.

This is what I am trying to explain as a teacher.
I can "see" a circuit working and you have to gravitate to this condition.
That's why everything has to be in the correct position on a circuit diagram.
A circuit speaks immediately and anyone who provides a list of components and letters such as R1 R2 on a circuit diagram is not an engineer.

That is just absurd. What university did you get your EE degree from?

 

[colin55]

I am trying to keep the whole document simple and easy to understand. I don't like the 555, and I have never used it.
In fact it performs very badly when in a 5v circuit.
I am not going to keep running around in circles when there is a lot of jargon that is accepted, to make things easy to recognise and remember and using the term "TTL 555" recognises the version the poster described in the article.

 

[Mikebits]

I am trying to keep the whole document simple and easy to understand. I don't like the 555, and I have never used it.
In fact it performs very badly when in a 5v circuit.
I am not going to keep running around in circles when there is a lot of jargon that is accepted, to make things easy to recognise and remember and using the term "TTL 555" recognises the version the poster described in the article.

You left out.

 

[colin55]

That's why we are poles apart.
I have made over a million out of electronics and retired 10 years ago.
I have students coming to me from 20 years ago saying they got their start in electronics via the magazine articles I wrote.
Isn't it funny.
No-one who has bought any of my 750,000 books or over 300,000 kits has complained.
In this world, you should never give away your information for FREE.

 

[ericgibbs]

In this world, you should never give away your information for FREE.

So why are you a member of this Forum.?

Is it to promote your website and books.?

 

[colin55]

Believe me, no-one from this website is buying any books or kits. Everyone on this forum wants something for FREE.

The web has changed everything entirely. Every book and magazine (ever printed) is available on the web for free.

 

[ericgibbs]

Believe me, no-one from this website is buying any books or kits. Everyone on this forum wants something for FREE.

The web has changed everything entirely. Every book and magazine (ever printed) is available on the web for free.

Then I suggest you make your mind up, which is it.

In this world, you should never give away your information for FREE

Everyone on this forum wants something for FREE.

 

[Mikebits]

That is just absurd. What university did you get your EE degree from?

You have seemed to dodge this question. Am I to assume you are a self-proclaimed expert with no EE credentials, yet you presume to speak for what the EE community does and doesn't do?

 

[bryan1]

That's why we are poles apart.
I have made over a million out of electronics and retired 10 years ago.
I have students coming to me from 20 years ago saying they got their start in electronics via the magazine articles I wrote.
Isn't it funny.
No-one who has bought any of my 750,000 books or over 300,000 kits has complained.
In this world, you should never give away your information for FREE.

Colin that quote goes straight over my head 750,000 books 300,000 kits so just what magazine and what kits???????

No names of the books or kits have been mentioned

I've been involved with electronics for near 15 years now and live in Oz so why haven't I heard of you or your mags or kits ???

As far as your last quote if your that small minded go back into your hole and make the world a better place.....