simplicity - thanks to single gates you will have much less and shorter wires at schematic - so it is simpler,
readability - if you can understand functionality at glance (took it from dictionary, hope means what I wanted) and single gates gives it
With overview I can agree but only in sense that you faster can count how many ICs are used. But that information you have in BOM and you see at PCB drawing.
This is true for most ICs used nowadays (microcontrollers, memory, programmed logic) as they just canāt be divided into separate small blocks not affecting the others.
But if IC consists of separate parts with no interaction between them and each part will be used in a little different functionality (one as a generator, other as a separator, other as RC slope delay) you canāt think of the whole IC in category of its functionality as each part were used separately to fulfill different function.
But the whole discussion is academic. Who still uses the 7406 like ICs. I donāt remember using chips like this in this century. I have used some single-gates like 74LVC1G14 (but not 74LVC14).
We are speaking only about drawing separate parts having no functionality interaction with other separate parts and not drawing each transistor from IC separately. IC to have 1000 components that could be drawn separately would have to have at least 2002 pins.
Where there are no, and canāt be any functional interaction between them inside IC.
Of course.
To understand any complicated problem it is best to divide it into smaller ones. All science works that way. If IC has separate blocks it is much easier to find if one of them is broken if you think only of its functionality and not try to understand all separate parts at once. Of course if you find one broken you have to replace the whole IC.
And I am trying to understand the reason behind standards. That is why I am asking what such schematic gives you.
About what I described with RS485 I wonder why they want it to work sending frames continuously loosing at the same time the possible speed of reaction.
more emission (even it is under limits),
RS485 IC consumes 40mA when sending (terminal resistors) and 0.3mA when not sending.
The whole world is figuring out how to save energy. There is a limitation on the power consumed in stand-by. Suddenly, all RS485s in access control systems are expected to consume about 20 times more power than is actually needed.
I suppose I will write to them. But not yet - I need to get to know this standard thoroughly so as not to write some stupidity, and I donāt really have time to read it (it is not me who just change our communication to be as they want). As I once wrote to NIST, I didnāt get a reply, but they added test vectors very quickly where they didnāt have enough of what I wrote to them. But this time I donāt expect they will do anything about it.
If Europe is like my country, the departments are run by bureaucrats who employ specialist advisers on contract. The advisers tell the bureaucrats what the bureaucrats want to hear, otherwise those advisers may lose their contracts.
The bureaucrats will not want to change published standards because that will cost more money, draw attention to themselves and may show those bureaucrats as incompetent, in which case they may lose their employment.
Being able to scan/read a drawing quickly and understand it without having to first figure out how the person who made it was thinking and what is meant by the way it is drawn.
Be assured if more than one person/company worked on the drawing it will be consistent and not filled with all sort of personal touches.
Be assured that the person in charge of the drawing and the person in charge of the device/installation communicate in the same (symbolic) language so they understand each other and no dangerous things will happen.
Just to name a few.
And no, standards arenāt perfect. Nothing is. We agree on some rules and we follow them, thatās how most things work in society. There is always room for improvement and we can point out mistakes when we see them hoping they will get fixed.
That could explain me, but if you are then I really donāt understand why you can say that understanding schematic with gates grouped as they are in ICs is easier then understanding schematic where each gate is drawn at the place of circuit it is needed.
Sorry. I just canāt understand this and I know I will be not able to understand it whatever you will say.
We just should conclude that human brains simply functions differently in each copy of the homo-sapiens
I donāt think I said it was easier (that depends on the IC I guess). I said it was less complex (fewer symbols/lines on the drawing).
You donāt need to know/see what is inside an IC to understand the schematic and itās general function. If -for whatever reason- you de need to know what goes on inside (e.g. your engineering/designing instead of building/repairing). You get the datasheet. The information is on there. There is no need to copy it unto the drawing. Its redundant.
I had the impression that it is not mandatory to include everything that belongs to an ic (for example) inside the same symbol, but, symbols that have a physical link should be Edit: joined with a dashed line.
That brings to more lines but cleaner operational representation. Standards do not mandate how you should represent your idea they try to enforce consistency.
I remember when we were taught about gates, there was never mentioned that those definitions were from IEEE standard, i got mixed feelings when i got to the IEC side of schematicsā¦
means that in other case (with gate symbols distributed where the are needed) reading and understanding would be not so quick so less easy. From that I concluded that you are saying that in case with gates gruped understanding is easier.
English is not my first language, and many times here at forum I made some mistakes in saying and understanding the others.
Itās fine to split an IC up (with dashed lines) if it helps with readability. As well as rearrange the pins (they donāt need to be in order or in the right location) I never worked with IEEE as I worked solely in Europe and while there are some areas where it is used, I never touched it myself.
Thatās fine. English isnāt my first language either and I too often misunderstand or am misunderstood.
āUnderstandingā as in looking at a circuit and āseeingā what it is supposed to do. What its function is in a general matter.
If you need understanding on a more fundamental basis (tracing signals e.g.) you get the datasheet and other things, a marker, a piece of paper etc. and you start analysing.
Just the drawing on itself is made for building/repairing. The drawing combined with all other documents is for analysing, designing, engineering, learning, etc.
Are you all the time speaking about schematic among other drawings?
For me the PCB drawing is made for building/repairing and not schematic.Schematic is for understanding.
I get from KiCad 2 drawings of PCB:
one with each element named by its reference (R1, R2,ā¦)
second with element values on them (1k, 2k2,ā¦)
The second is not needed to manufacture PCB. I use it when trying to find a problem with circuit as I am not interested if the resistor is R1 or R7 but if it is 1k or 100k.
We have never included schematic into documentation send to contract manufacturer and they (we use two) produce PCBs without even seeing the schematic. So for me:
schematic is not needed to manufacture,
schematic is needed to found damage, but when found which element is brokenā¦
schematic is not needed to repair.
During searching the damage you need to understand how circuit works and all information you can get as easy as possible is welcome and because of it I prefer to see individual gates at the signal route and not shifted somewhere just to show that part of this IC was used.
But as I said previously: In my opinion the whole discussion is academic. Who stil uses LSI ICs. For nowadays used ICs the problem of drawing them as separate parts simply not exists as it is not possible to separate them out.
Letās take a relay.
Sometimes I draw a complete relay; other times I split the relay, coil and logic at different places of the circuit, even in different sheets.
The aim is the ease to understand how the circuit works.
I canāt figure out how to make a symbol of a more than 480 pin fpga without splitting it in several units.
