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'[EE] Maxim MAX7300 I2C port expander'
2005\12\08@122048 by James Humes

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Hello Everyone,

    I'm looking for the MAX7300 port expander but it seems that none of my
usual suspects (Digikey, mouser, allied, future, newark) have any.  I've
been quoted a 40 day lead time for a few samples.

   The part is in use by Chevy and Ford, so I assume there are plenty
manufactured.  I've heard, though, that the auto industry has the ability to
use up an entire production quantity of some parts.

   Right now I just need a couple samples (44pin QFN) but before long we'll
need 30,000 and would rather not commit to this part if its too hard to come
by.  Does anyone know of any other avenues to look down?

Thanks all!

James

2005\12\08@124833 by Mario Mendes Jr.

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I don't know you requirements other than expand ports via i2c, so this may
not be exactly what you need, but Microchip makes a few of those.  Both
the MCP23016/17 are 16 bit i/o port expanders, the 16 vcc is 2.0 to 5.5
and the 17 vcc is 1.8 to 5.5, also, the 16 has a max bus frequency of
400kbits/sec while the 17 is 1700 kbits/sec.  The budgetary price is $1.15
for the 16 and $0.86 for the 17.

Good luck.

-Mario

{Quote hidden}

> -

2005\12\08@125807 by James Humes

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Thanks Mario,

   The only problem with those is that we need 28 IO ports.  It would be
easy enough (for me, the software guy) to just use two of them but now the
board is layed out and there would be resistane to changing it if we could
just find the right part somewhere.  It may be that we end up having to use
these parts and just redo the board.

   I saw on the CCS compiler site example code for the MAX7300.  Thats
another thing that would make me think it would be more available, but
alas...  still looking.

James

2005\12\08@125942 by Paul Hutchinson

picon face
> -----Original Message-----
> From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu On Behalf Of James Humes
> Sent: Thursday, December 08, 2005 12:21 PM
>
>      I'm looking for the MAX7300 port expander but it seems that
> none of my
> usual suspects (Digikey, mouser, allied, future, newark) have any.  I've
> been quoted a 40 day lead time for a few samples.

Check the availability at their e-commerce site:
https://shop.maxim-ic.com
(no registration needed for price and availability checks)

Using MAX7300 it shows that quite a few of the variants are in stock for
<100 piece quantities. Also there are free samples in stock for a number of
the variants.

Paul

2005\12\08@131933 by James Humes

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>
>
> Check the availability at their e-commerce site:
> https://shop.maxim-ic.com
> (no registration needed for price and availability checks)
>
> Using MAX7300 it shows that quite a few of the variants are in stock for
> <100 piece quantities. Also there are free samples in stock for a number
> of
> the variants.
>
> Paul



 Hi Paul,

     The issue is that I need the QFN package (MAX7300AGL) and there is a 6
week lead time on it from Maxim.  We're putting together a few prototypes in
an RF application or else I would just use a different package and try to
make it work.  I was hoping to find a supplier with a stock of them.

James

2005\12\08@133946 by Mike Hord

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>     The only problem with those is that we need 28 IO ports.  It would be
> easy enough (for me, the software guy) to just use two of them but now the
> board is layed out and there would be resistane to changing it if we could
> just find the right part somewhere.  It may be that we end up having to use
> these parts and just redo the board.

They put a part in the PCB layout without checking availability first?  Shame,
shame.

Maybe this should just be a lesson to them to do more homework before
selecting a component.  And, incidentally, why are you (the software guy)
doing the legwork on a piece of hardware?

Mike H.

2005\12\08@135230 by olin piclist

face picon face
Mike Hord wrote:
> They put a part in the PCB layout without checking availability first?
> Shame, shame.

And considering it's a Maxxim part, they should have assumed availability
problems, whether it happens to be in stock at that time or not.


******************************************************************
Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC
consultant in 2004 program year.  http://www.embedinc.com/products

2005\12\08@140746 by James Humes

picon face
>
>
> They put a part in the PCB layout without checking availability
> first?  Shame,
> shame.
>
> Maybe this should just be a lesson to them to do more homework before
> selecting a component.  And, incidentally, why are you (the software guy)
> doing the legwork on a piece of hardware?
>
> Mike H.


Hi Mike,

    Its a small company (3 people total) so we have to fill different roles
at different times.  My boss does the electronic design and layout so it is
hard (or rather, not my place) to distribute shame for this kind of thing:)
Its not life or death since we're just prototyping.  The personal
issue (that you may be able to see) is that I'd rather not tell my boss to
lay the board out again if at all possible, especially since the part is
available just with a long lead time.  But, on the other hand, we do need to
get these prototypes going.

James

2005\12\08@143850 by David Van Horn

picon face
> I'd rather not tell my boss to
> lay the board out again if at all possible, especially since the part
is
> available just with a long lead time.  But, on the other hand, we do
need
> to get these prototypes going.

Two words:  Strategic buy.


2005\12\08@161530 by Mike Hord

picon face
>      Its a small company (3 people total) so we have to fill different roles
> at different times.  My boss does the electronic design and layout so it is
> hard (or rather, not my place) to distribute shame for this kind of thing:)
> Its not life or death since we're just prototyping.  The personal
> issue (that you may be able to see) is that I'd rather not tell my boss to
> lay the board out again if at all possible, especially since the part is
> available just with a long lead time.  But, on the other hand, we do need to
> get these prototypes going.

This is exactly the time for him to learn this lesson.  Of course, "shame"
may not be the way to go about it, but if you can't find it (or a pin
compatible drop-in), shame or not, you're up a creek.  And if he carries
on designing things with no eye towards actually being able to produce
them, that creek will be very wide and very deep.

If you're going to make 30,000 of these, you may even need to be
thinking beyond availability to "what's available in China" (or
wherever you're having these 30,000 units assembled).

FWIW, I do some work in a 3-person outfit, doing hardware and firmware,
and I learned that lesson the hard way as well.  I had several "perfect"
components, and then learned to my chagrin that they were unavailable.
I didn't actually get to the point of having PCBs made with the wrong
component footprint, but I did do a layout that I had to change.

Sidebar- does TI make a replacement?  They seem to make a fair
number of clone parts, and sometimes have better availability than
Maxim.

Mike H.

2005\12\08@200653 by Bob Axtell

face picon face
James Humes wrote:

>Hello Everyone,
>
>     I'm looking for the MAX7300 port expander but it seems that none of my
>usual suspects (Digikey, mouser, allied, future, newark) have any.  I've
>been quoted a 40 day lead time for a few samples.
>
>    The part is in use by Chevy and Ford, so I assume there are plenty
>manufactured.  I've heard, though, that the auto industry has the ability to
>use up an entire production quantity of some parts.
>
>    Right now I just need a couple samples (44pin QFN) but before long we'll
>need 30,000 and would rather not commit to this part if its too hard to come
>by.  Does anyone know of any other avenues to look down?
>
>Thanks all!
>
>James
>  
>
This has happened so many times with Maxim that most designers have
given up. Add also a
high cost, and you have a recipe for disaster.

Don't design these guys in. They are flimflam artists.

--Bob

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Note: To protect our network,
attachments must be sent to
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1-520-777-7606 USA/Canada
http://beam.to/azengineer

2005\12\08@205725 by Chen Xiao Fan

face
flavicon
face

> -----Original Message-----
> From: piclist-bouncesspamKILLspammit.edu
> Sent: Friday, December 09, 2005 9:07 AM
>
> This has happened so many times with Maxim that most
> designers have given up. Add also a  high cost, and
> you have a recipe for disaster.
>
> Don't design these guys in. They are flimflam artists.
>
> --Bob

I just do not know why they are still doing so well since
lots of the people advise not to design Maxim parts in.
Maybe all the leading analog IC vendors like Analog Device and
Linear Tech and Maxim all have similar problems. Still it
is hard to avoid them in some designs. Last time I was
designing a level sensor (cost is almost not an issue there
since the major cost is not the electronics and the
margin is very high) I still use a Maxim part (MAX4634EUB)
due to its better performance and small packaging.
That is why company

Now I am in a different situation where cost is the
most important factor and I will try to avoid any
expensive parts and parts with potential delivery
problems (like an AVR MCUs and Maxim parts).

Regards,
Xiaofan

2005\12\09@043842 by Alan B. Pearce

face picon face
>especially since the part is available just with a long
>lead time.  But, on the other hand, we do need to
>get these prototypes going.

Sounds like it is time to lean on Maxim "what do you mean we cannot get
them, we design them in, and now you say you don't have them?"

2005\12\09@074048 by olin piclist

face picon face
> Sounds like it is time to lean on Maxim "what do you mean we cannot get
> them, we design them in, and now you say you don't have them?"

Answer: You want 100?  <muffled>Hey Frank, I've got this guy on line 2 that
wants 100!</muffled>  <pause until everyone gets done lauging>  We won't
have stock for about 16 weeks.  I'm really sorry sir, there is nothing I can
do.  Try some of our distributors.

Honest answer: If we really cared whether gnats like you bought 100 parts
we'd have them in stock, wouldn't we?  Duh!  I've got to get back to a real
customer that needs 500000 of these parts next week.  Click.


******************************************************************
Embed Inc, Littleton Massachusetts, (978) 742-9014.  #1 PIC
consultant in 2004 program year.  http://www.embedinc.com/products

2005\12\09@085100 by Mike Harrison

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face
On Fri, 9 Dec 2005 07:42:30 -0500, you wrote:

>> Sounds like it is time to lean on Maxim "what do you mean we cannot get
>> them, we design them in, and now you say you don't have them?"
>
>Answer: You want 100?  <muffled>Hey Frank, I've got this guy on line 2 that
>wants 100!</muffled>  <pause until everyone gets done lauging>  We won't
>have stock for about 16 weeks.  I'm really sorry sir, there is nothing I can
>do.  Try some of our distributors.
>
>Honest answer: If we really cared whether gnats like you bought 100 parts
>we'd have them in stock, wouldn't we?  Duh!  I've got to get back to a real
>customer that needs 500000 of these parts next week.  Click.
>

Sounds like typical Maxim..... easy samples but you're stuffed for production.
Maxim is close to the bottom of the list of suppliers I consider designing in as they've always been
like this.

I think a significant reason for Microchip's success is that they have a stated policy , and track
record, of very good availability & short (typically zero) leadtimes for any quantities - streets
ahead of most of the competition.

2005\12\09@085819 by Bob Axtell

face picon face
Olin Lathrop wrote:

{Quote hidden}

Olin: nobody could have explained it better.
Have a great day.

--Bob

--
Note: To protect our network,
attachments must be sent to
.....attachKILLspamspam.....engineer.cotse.net .
1-520-777-7606 USA/Canada
http://beam.to/azengineer

2005\12\09@151559 by James Humes

picon face
Thanks for all the feedback on this.  I think I detected hints of sarcasm
here and there but being as I don't have the emotional capacity to detect
this sort of thing I couldn't really say.  <g>  Solution:  Relayout the
board to use microchip's io expanders and check availability more carefully
in the future.

A slight aside:  I know of someone who had a product designed around a TI
part that had been in production for several years when TI obseleted
(obselesced?) the part.  Apparently 4 or 5 different medium volume customers
complained and TI decided to keep the part alive out of kindness and good
customer service.

I'm working on a 30K units a year product now, but I just graduated and this
is my first real job...  A few years from now who knows..  I may be working
on higher volume product in a role where I'm choosing the parts to design
around and my experiences now (both technical and customer service
related) will be formative (subconciously and conciously) in which parts I
choose later.

However, I don't mean to sound disgruntled because I'm actually relatively
gruntled.


Thanks everyone,

James

2005\12\09@183208 by alan smith

picon face
well.....I never design in a maxim part. Period.  Even if it costs a little bit more to use two parts, or from a different vendor.....its well worth the frustration of NOT being able to get parts during production.  Been burned a few times....learned...
 
 We use the microchip part and it has a nice feature of latching the inputs so if you get an irq that something changed...you can go read it at your leisure and then clear it.
 
 nice feature I think!

                       
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2005\12\09@194456 by James Humes

picon face
Also, the microchip port expanders are cheaper for two than a single of
these other parts.

James


On 12/9/05, alan smith <EraseMEmicro_eng2spam_OUTspamTakeThisOuTyahoo.com> wrote:
{Quote hidden}

>

2005\12\09@211457 by William Chops Westfield

face picon face
On Dec 9, 2005, at 3:32 PM, alan smith wrote:

> .I never design in a maxim part. Period.

Even after they acquired Dallas?  Dallas had/has some nice parts, and
they never had quite the "unobtainium" reputation of the Maxim parts.
Has that gotten worse since the merger?  I was always a bit surprised
that Maxim bought Dallas rather than the other way around...

BillW

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