74HCT74 what in the world is this logic gate circuit?

Thread Starter

ZomBoSk8r

Joined Aug 8, 2017
5
Hello all. So I'm an engineering technician who typically doesn't deal with circuits on this code of a level, but a passion of mine has me recently diving deep into old school IC chips in great detail. That passion would be the Redstone creations using the video game Minecraft.

Do to the heart of the matter.

The attached picture is of a 74HCT74 chip. I understand the use of this chip but as I'm trying to create the blocky logic gates I came across the weird mid section of this chip. Can someone explain to me what exactly and how the portion that looks like 2 inverters pointing into each other with 2 buffers pointing each other works? Because with my understanding of this circuit I'm seriously confused how an inverter or buffer would output into a line that had a clock pulse inputting into that line as well. In a dc circuit it would basically look like 3 lines merging into a point with no where to go.

See. I'm seriously confused. Lol

Any and all help would be greatly appreciated.

Sincerely,

ZomBoSk8r
 

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MrChips

Joined Oct 2, 2009
34,671
Those two inverters pointing into each other are not inverters pointing into each other.
The whole symbol is that of a transmission gate. It is a way of creating a wire-OR circuit, much like when using tri-state drivers.
 

Thread Starter

ZomBoSk8r

Joined Aug 8, 2017
5
Those two inverters pointing into each other are not inverters pointing into each other.
The whole symbol is that of a transmission gate. It is a way of creating a wire-OR circuit, much like when using tri-state drivers.
Thank you very much. that was part of the piece to my puzzle, putting a name to that portion. it had been many years since i had seen the bowtie schematic.

Mmk so now a follow up question.

In the game Minecraft there is no variance in power levels, hence no ability to create transisters. All we are currently able to create is basic logic gates (i.e. and, or, nand, nor, xor, xnor, and the flip flops and adders etc that can be made with those basic logic gates), so the real next question would be this.

I am using a schematic of a 4 but homebrew computer and I've been slowly turning it into Minecraft Redstone blocks, obviously anything that requires variance in power level or grounding just gets thrown out the window as it is unnecessary to make it work in game. For instance the computer uses an NE555 chip as the clock, had to dismiss that and just use a 5 clock circuit that other Minecrafters had designed. But I struggle with doing this because I want to as accurately as possible within the constraints of the game represent the real life IC chips to the fullest.

So to once again state my real question, lol

Is there a way to make this 74hct74 circuit (specifically the transmission gates) using only basic logic gates (no transistors or things requiring a varying power output)
 

WBahn

Joined Mar 31, 2012
32,745
Thank you very much. that was part of the piece to my puzzle, putting a name to that portion. it had been many years since i had seen the bowtie schematic.

Mmk so now a follow up question.

In the game Minecraft there is no variance in power levels, hence no ability to create transisters. All we are currently able to create is basic logic gates (i.e. and, or, nand, nor, xor, xnor, and the flip flops and adders etc that can be made with those basic logic gates), so the real next question would be this.

I am using a schematic of a 4 but homebrew computer and I've been slowly turning it into Minecraft Redstone blocks, obviously anything that requires variance in power level or grounding just gets thrown out the window as it is unnecessary to make it work in game. For instance the computer uses an NE555 chip as the clock, had to dismiss that and just use a 5 clock circuit that other Minecrafters had designed. But I struggle with doing this because I want to as accurately as possible within the constraints of the game represent the real life IC chips to the fullest.

So to once again state my real question, lol

Is there a way to make this 74hct74 circuit (specifically the transmission gates) using only basic logic gates (no transistors or things requiring a varying power output)

I'm not at all familiar with this Minecraft game, so I have no idea what "a schematic of a 4" is or "a 5 clock circuit" is. Nor do I know what the rules and constraints of the game are.

Is the game capable of simulating fundamental-mode circuits?
 

Thread Starter

ZomBoSk8r

Joined Aug 8, 2017
5
I'm not at all familiar with this Minecraft game, so I have no idea what "a schematic of a 4" is or "a 5 clock circuit" is. Nor do I know what the rules and constraints of the game are.

Is the game capable of simulating fundamental-mode circuits?
Here's a link to the Minecraft wiki. It'll do a quicker job of explaining the game mechanics than I can discuss here (I could go on for pages about it. Lol)
 

Thread Starter

ZomBoSk8r

Joined Aug 8, 2017
5
Does it have to be a 7474 edge-triggered D-type flip-flop?



You can make a simple S-R flip-flop with just two gates.
You can also make a clocked D-type flip-flop.
Or you can build a master-slave flip-flop.

https://forum.allaboutcircuits.com/blog/flip-flop-fundamentals.705/
I've thought about just using a basic positive edge triggered d flip flop as I already have a design fur the game I use often, my only issue with that is that it means im esentially creating a different chip and that takes away from my desire to be as close to representing the actual chip used. I think my goal may be too lofty for recreating inside the world of Minecraft.
 

WBahn

Joined Mar 31, 2012
32,745
Here's a link to the Minecraft wiki. It'll do a quicker job of explaining the game mechanics than I can discuss here (I could go on for pages about it. Lol)
And I'm not interested in reading pages and pages about some game that I have no interest in. But good luck to you.
 
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