Simulation software question ...

[rgb]

I just begin to use circuit simulation software (demo for CircuitMaker)
and just found something strange...

Why don't gates follow real gate pinout ?
Is it just my software or it a common thing? so you won't be able to
have an idea of the real routing pcb until you pass you circuit to
another soft ?

 

[Terry Pinnell]

I just begin to use circuit simulation software (demo for CircuitMaker)
and just found something strange...

Why don't gates follow real gate pinout ?
Is it just my software or it a common thing? so you won't be able to
have an idea of the real routing pcb until you pass you circuit to
another soft ?

I use CircuitMaker, but don't follow your question. Could you clarify.
Perhaps post a schematic in alt.binaries.schematics.electronic? Or
draw an ASCII diagram in your reply.

 

[Check It Out]

SPICE is for chicken and fish, not design. Give it up until you are an
awesome engineer. Becomes a paralyzing crutch used early on.

Nothing better than learning to solder and building it.

 

[rgb]

Take a 74LS244, from my old TTL databook
pins are
2 1A1
3 2Y4
4 1A2
5 2Y3
....

From the simulator pinout is not the same, functions inside seems to be
respected but not pinout layout.

So again,
why don't gates follow real gate pinout ?

Is it just CircuitMaker or it a common way to do thing ?

This means also that you won't be able to have an idea of the real pcb
routing layout until you process you circuit with another soft ?

 

[rgb]

I'm in fact testing some stuff with that software, I don't own an
osciloscope and I don't have that much money to buy one, after a few
simple tests it seems kinda OK.
Now it's time to continu my breadboard filling ;o)
I don't thing I'll solder my current project but ...
Who knows )

 

[Terry Pinnell]

Take a 74LS244, from my old TTL databook
pins are
2 1A1
3 2Y4
4 1A2
5 2Y3
...

From the simulator pinout is not the same, functions inside seems to be
respected but not pinout layout.

So again,
why don't gates follow real gate pinout ?

Is it just CircuitMaker or it a common way to do thing ?

This means also that you won't be able to have an idea of the real pcb
routing layout until you process you circuit with another soft ?

OK, understand what you mean now. Has me puzzled too. I'm not familiar
with that chip (or any tri-state chips for that matter), so can't say
for sure. But looking at the full list
Function
--------
Pin CM rgb
--- --- ---
1 0EA
8 1a3
6 1a2
4 1a1 1A2
2 1a0 1A1
19 0Eb
11 1b3
13 1b2
15 1b1
17 1b0
12 Ya3
14 Ya2
16 Ya1
18 Ya0
9 Yb3
7 Yb2
5 Yb1 2Y3
3 Yb0 2Y4

I'd guess for a start that 0 maps to 1 and 1-->2.
And outputs are called 'Y' in both cases. And where CM calls the first
and second sections or 'halves' a and b respectively, your texts opt
for that different approach.

Maybe someone who knows the chip will comment?