Hi, im migrating my hardware to the new RCM4XXX series. I see that use
the same pin design, congrats to apply common sense in that area.

I already have a kit RCM4400W. My idea is design a board for all the
series allowing use any of them according to the needs.

My board use 5 serial ports B,C,D,E and F. Also needs 6 pins for
output. One pin for connect to one-wire network.
That's all i required, but is required always.

Now the question:

Is possible to build that design allowing to plug under requirement
the all brand of RCM4XXX series?

Also, i forget to ask, i use 74125, 74138 and 74126 LS series actually
to work with RCM3000. Are that series the recommended for RCM4XXX or
theres some trouble with thats?

TIA

Donald.
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promolinux wrote:
> Also, i forget to ask, i use 74125, 74138 and 74126 LS series actually
> to work with RCM3000. Are that series the recommended for RCM4XXX or
> theres some trouble with thats?
>
The LS series of parts are all but obsolete. I stopped using them in the
late 80's. You should use the 74HC or 74HCT parts as they consume much
less power and have better noise immunity. The 74HCT parts are good if
you use 5V logic with a 3.3V (or lower) CPU.

--
------------------------------------------
| Scott G. Henion| s...@shdesigns.org |
| Consultant | Stone Mountain, GA |
| SHDesigns http://www.shdesigns.org |
------------------------------------------
Rabbit libs: http://www.shdesigns.org/rabbit/
today's fortune
Q: Why is it that Mexico isn't sending anyone to the '84 summer games?
A: Anyone in Mexico who can run, swim or jump is already in LA.
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--- In r...@yahoogroups.com, Scott Henion wrote:
>
> promolinux wrote:
> The LS series of parts are all but obsolete. I stopped using them in the
> late 80's. You should use the 74HC or 74HCT parts as they consume much
> less power and have better noise immunity. The 74HCT parts are good if
> you use 5V logic with a 3.3V (or lower) CPU.

Thanks for your quick answer.

The problem is in my country is hard to get HCT parts in smd. :(
I find a AN talking about diffs between LS and HC, and theres is
recommended to use HCT also when using in the way i required..

TIA

Donald.

------------------------------------



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If you are using LS logic with the 3000, you should be able to use it
with the 4000. The I/O is the same, 3.3V, though the fan-out may be
different. I couldn't find a reference for drive capability in the
3000 docs I have on hand.

It's hard to imagine LS logic is easier to get than HC or any other low
voltage family in smd. Just curious, where are you?

Mark

------------------------------------



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--- In r...@yahoogroups.com, "mehiegl" wrote:
>
> If you are using LS logic with the 3000, you should be able to use it
> with the 4000. The I/O is the same, 3.3V, though the fan-out may be
> different. I couldn't find a reference for drive capability in the
> 3000 docs I have on hand.
>
> It's hard to imagine LS logic is easier to get than HC or any other low
> voltage family in smd. Just curious, where are you?
>

Where the world ends... Argentina. :)

Anyway, already search in mouser and will buy the needed parts from
internet. I'm tired of condition designs for parts easy to find here.
Donald.
------------------------------------



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