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'[EE:] Level translators?'
2004\04\14@115056 by Harold Hallikainen

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Anyone have any favorite 3V to 5V level translators? I've designed the
MAX3008EEUP into a circuit and would like to test it before the chips show
up in 25 weeks. I'm converting 3 lines from 5V down to 3V and 1 from 3V to
5V.

THANKS!

Harold


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2004\04\14@124954 by Spehro Pefhany

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At 08:47 AM 4/14/2004 -0700, you wrote:
>Anyone have any favorite 3V to 5V level translators? I've designed the
>MAX3008EEUP into a circuit and would like to test it before the chips show
>up in 25 weeks. I'm converting 3 lines from 5V down to 3V and 1 from 3V to
>5V.

TWENTY-FIVE WEEKS!!!!!  Why don't you design them OUT again ???

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
.....speffKILLspamspam@spam@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2004\04\14@130030 by Harold Hallikainen

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I'm tempted to design it back out, but it's a REALLY NICE PART! And, I
can't find a replacement. I'm really cramped for board space. On the
prototype, I'm going to put in some voltage dividers for 5V to 3V and a
diode and pull-up to try to get the 3V to drive a PIC 5V input. The MAX
part has 4 3V to 5V translators and 4 5V to 3V translators in a very small
20 pin package. I don't see that anyone else is making anything like it
(at least I have not found it yet, which is why I'm asking the list!).

Harold
> At 08:47 AM 4/14/2004 -0700, you wrote:
>>Anyone have any favorite 3V to 5V level translators? I've designed the
>>MAX3008EEUP into a circuit and would like to test it before the chips
>> show
>>up in 25 weeks. I'm converting 3 lines from 5V down to 3V and 1 from 3V
>> to
>>5V.
>
> TWENTY-FIVE WEEKS!!!!!  Why don't you design them OUT again ???

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2004\04\14@200554 by David P Harris

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Hi Harold-
I have mentioned this before, but no one has commented.
Phillips recommends using mosfets as level shifts for I2C.  The cicuit
is below:
         +3V     +3V      +5v
          |       |        |
          |      ---       |
          R   ---------    R
          |    |  ^  |     |
          |    |  |  |     |
 3V line -+----+--+  +-----+--- 5V line
              |     |
              +-->|-+

(use fixed width font)
this presupposes that the two sides are pulled high.  There are three cases:
1/ when both sides are high, mosfet is off
2/ when 3v is pulled low, the mosfet is on, and pulls 5v side low.
3/ when 5v is pulled low, the body diode conducts and pulls the 3v side
low.

Obviously the mosfets can be really small.
David




Harold Hallikainen wrote:

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2004\04\14@214638 by Harold Hallikainen

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Thanks to all for the responses! The Maxim part will be great once I can
get one! 8 level translators in a really small package. I'll use ideas
from the list for a work around for now.

Thanks!

Harold


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2004\04\15@043147 by Alan B. Pearce

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>I'm tempted to design it back out, but it's a REALLY NICE PART! And, I
>can't find a replacement. I'm really cramped for board space. On the
>prototype, I'm going to put in some voltage dividers for 5V to 3V and a
>diode and pull-up to try to get the 3V to drive a PIC 5V input. The MAX
>part has 4 3V to 5V translators and 4 5V to 3V translators in a very small
>20 pin package. I don't see that anyone else is making anything like it
>(at least I have not found it yet, which is why I'm asking the list!).

Shucks for a 6 month lead time, I would seriously look at using the Philips
recommended method of level shifting I2C lines. Check out the I2C document
at
www.semiconductors.philips.com/acrobat/literature/9398/39340011.pdf
for details.

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2004\04\15@143112 by Bob Blick

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Better be careful, that use of a mosfet (interfacing between buses of
different voltages) is covered by US patent #5689196

I don't know what limits Philips puts on its use, but I'd bet if you use
it for anything other than I2C interfacing, you are out of the realm of
"free" licensing.

-Bob

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2004\04\15@154421 by Harold Hallikainen

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By the way, searching further, I found the MAX3392 that actually exists
and does what I want. Samples on order!

Harold



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2004\04\15@205152 by David P Harris

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Jeesh-
Seems to be a rather trivial piece of engineering to have a patent attached!
David

Bob Blick wrote:

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2004\04\15@211229 by Richard.Prosser

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face
A lot of patents are

RP



Jeesh-
Seems to be a rather trivial piece of engineering to have a patent
attached!
David

Bob Blick wrote:

>>           |    |  |  |     |
>>  3V line -+----+--+  +-----+--- 5V line

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