Need two 89C51RE2SLSUM MCUs!

 Need two 89C51RE2SLSUM MCUs!

We are redoing an 87C51FB design with the 87C51MC2, which is readilly available from DigiKey. The problem is, the -MC2 is an OTP part, and we have a lot of code development to do yet. This is going to kill off a lot of parts before the coding is finished. So, we identified a FLASH part for this, the AT89C51RE2SLSUM, a PLCC44 part, which should do the job nicely.

BUT, after a week of fruitless search, the -RE2 is proving nearly impossible to find. Even Atmel won't supply samples, they refer us to DigiKey. DKey doesn't have any, and they require a minimum order of hundreds, as does everyone else who doesn't have them in stock. We found one distributor who would sell us just two for a premium price, but they're stock is in Hong Kong, so charge $200 shipping! Another distributor will supply two or three, but they won't have any until mid-July!

So I come here in the hopes someone can either suggest a known source with stock in the US or who can sell us a couple out of their stock, right here, right now. We will pay a premium, of course, within reason.

Thanks for your attention,
kenjj

 the only MX core uC I know of with flash memory ..

.. is the P89C669

You need check the datsheets to see if it will do (I think so)

Erik

 RE: the only MX core uC I know of with flash memory ..

Thanks for the speedy response.

The -669 was one of the chips we looked at originally. The -669 doesn't have the second UART, while the -RE2 does. This is a big deal to my employer. Also, it's being obsoleted. I've checked the data sheets on both. The -RE2 has the same pinout as both the -FB, which is what we're replacing, and the -MC2, which is our target for production. The -RE2 is just for code development, but we need something that is essentially the same. I didn't check the data sheets for all these, my engineering employer did, so here I am. If someone knows of a problem with these selections, please let us know!

Later!
kenjj

 RE: the only MX core uC I know of with flash memory ..

Also, it's being obsoleted
I am aware of that, but for development which is to go to another processor, that should not be a problem.

I would check a bit better to make sure Arghmel has copied the MX technology well enough.

If you do not have MX in the Arghmel chip, state so and possibilities will pour out.

Erik

 Still lookin' for -RE2s

Thanks for the input, Erik. I have no idea if Atmel did an MX core clone. That's for others to determine. my criteria are:
- pin-out compatible with 87C51FB
- PLCC44 package
- two UARTs
- PCA
- FLASH with 32k or greater
I've checked NXP, Atmel, Winbond, SiLabs, and others.
Let the suggestions pour forth...

As for the -669, I stand corrected. It does have two UARTs. Where it differs is in the pinouts. My employer prefers a drop-in replacement for the -FB. Or, as close to drop-in as possible. Thus, the -MB2/MC2 or -RE2. He did limited testing with the -MB2 last year and deemed it suitable. Now he wants to get two of the -RE2s so he can evaluate that for possible development for future designs. And, who knows, we may go all-FLASH.

So, I'm still looking for two AT89C51RE2SLSUMs. Anyone?

Later!
kenjj

 RE: Still lookin' for -RE2s

Thanks for the input, Erik. I have no idea if Atmel did an MX core clone. That's for others to determine.
Then why are you using a MX chip as replacement, (the only advantage of a MX chip is the 23 bit addressing of external memeory)?

my criteria are:
- pin-out compatible with 87C51FB
- PLCC44 package
- two UARTs
- PCA
- FLASH with 32k or greater
I've checked NXP, Atmel, Winbond, SiLabs, and others.
but have you searched the Keil device database

http://www.keil.com/dd/parm_search.asp

I just did it and said to myself "that can't be true" and found that the database bas a boo-boo that if you specify flash 32k or greater you gtet virtually no chips, just specify "don't care" for the flash size and scan manually.

Erik

 RE: Still lookin' for -RE2s

Yes, I checked the same night I posted this originally. And, I selected 32k or greater at the time, so I redid the search as you suggest, with no preference for mem size. I got the same answers now as then. I can't use the first two chips, they are not PLCC44. And - Ta!Da! - the other recommendations are the -MA2/MB2/MC2 (all OTP) and the -RE2, which I have already mentioned in the post. There seems to be nothing new under the sun for this.

So, does anyone have two AT89C51RE2SLSUMs?

Thanks for the attention.
kenjj

 I saw way more options, look again

erik

 RE: I saw way more options, look again

there is 'a million' uPsds and, if you can, for development go 3v3, the LPC952

Erik

 Different criteria

There may be millions, I'd like to see what criteria you used for your search. If I drop PCA channels from the search I get gobs of choices. And out of those gobs, it's still the same four suitable candidates: the -MA2/MB2/MC2 and the -RE2. But I don't get to choose, my employer made these choices. I lobbied hard for the -952, everything we have on the product would be in the MCU, and it's $2.46 in qty/one!! But I got shot down, he wants a 87C51FB clone (preferably), with two UARTs and more mem space. The -MB2/MC2 fits the bill, and the -RE2 gives us FLASH.

So, my criteria are to start with a 87C51FB in PLCC44 packaging and add two UARTs. Thus:
-87C51FB pinout
-5V
-PCA channels
-two UARTs (or more)
-FLASH 32K or more (for this go-round)
If anyone has any suggestion(s) for suitable alternatives using these criteria, please let me know.

Otherwise, does anyone have two AT89C51RE2SLSUMs?

Thanks for the input so far.
kenjj

 then buy an ICE

Ceibo, Nohau, Lauterbach ... more

that will be a much better development environment anyhow.

sorry about suggesting chips without what you had not said you needed.

Erik

 Thanks for the effort...

Thanks for the suggestions, so far, Erik.

I'm hardly the resident programming expert. I'm aware that there are virtual environments available to build code in. My employer, however, has 10s of 1000s of lines of well established code existant, and an established code-testing methodology he is comfortable with. More power to him, lots of pay checks will attest to his ability to produce sellable products. Not that he's hide bound, he has adapted new parts and methods before, but he knows what he wants and needs, and it will take something supplying an undeniable advantage to make him leave his comfort zone.

And the comfort zone is a great place to be.
kenjj

 RE: Thanks for the effort...

it will take something supplying an undeniable advantage to make him leave his comfort zone
he might not take my word for it, but an ICE is "an undeniable advantage" for development and there is no need to "leave his comfort zone" in order to buy an ICE. The end result is the same (you do not do final test with the ICE plugged in)

Erik

 RE: Need two 89C51RE2SLSUM MCUs!

Dear Kenjj,

Who is the distributor in Hong Kong of AT89C51RE2-SLSUM in stock?
Thanks,

Lidio

 RE: Need two 89C51RE2SLSUM MCUs!

Sorry, I can't say. I'm at home today and all the contact info is not at hand. Besides, I tossed all the previous search paperwork almost two weeks ago, which includes that info. The web searches I did found a couple of sites with thousands in stock.

I remember I contacted AERI.com (RFQ), and Arrow Electronics at (408) 453-1200. I have a note on my calender at work to call a salesmen in mid-July about a shipment they were expecting of these. He claimed (two weeks ago) they had 374 left to sell after deducting orders already placed. Just now I've tried a couple of Google searches and perused the Atmel distributor's info, and nothing jogs my memory that way. I'm back at work Sunday, and will try to find references to the search info. How many are you looking for?

Sorry I can't help just now.
kenjj

 RE: Need two 89C51RE2SLSUM MCUs!

Dear Kenjj,

Thanks for your reply.We are needing 250 units.
After developing a new product during 3 years, we realize it was a bad choice component. We had some dificulties with AT89C51RE2-SLSUM it is true but we thought it would be resolved in time by ATMEL.

Lidio

 the sad story is that you are the umpteenth

but we thought it would be resolved in time by ATMEL.
the sad story is that you are the umpteenth that has thought so about Arghmel.

When they did me in long ago I decided for good never to use an Arghmel chip.

Erik

 RE: Need two 89C51RE2SLSUM MCUs!

Hi. Here's the info I promised:

Arrow Electronics
800-833-3557
Matt x4046

I don't know where you are, so if the 800 number is no good for you, let me know and I'll get the direct number. I hope these guys still have the 374 available for your sake. These AREN'T the guys with stock in Hong Kong. I tried to recreate the search, but with no recognizable results. I may reverse engineer that name and number yet, so keep looking here.

BTW, what was the problem with this part that Atmel hasn't fixed, and what was your work around?

'Luck
Ken Jennejohn

 RE: Need two 89C51RE2SLSUM MCUs!

Ah! I believe it's these guys. I did a google search on "89C51RE2 distributors" and they popped up at the top:

1-Source Electronic Components
http://www.1sourcecomponents.com/partinfo/AT89C51RE2.htm
1-800-966-8826
These guys appear to be in the US. I remember contacting this group, among others. Their page shows they have several sources with this part in the hundreds and thousands. I also think they wanted $200 for shipping to the US! Ouch! Then again, that may be acceptable for 250 parts d*mn quick. Depends on where you are.

I went back and redid the search with "asia" in it and came up with this outfit at the top:
http://www.hobid.com/semiconductor-component/3.html

Enter the part number and get an invitation to submit an RFQ.

Hope this works for you!
Ken Jennejohn

 SUCCESS!

An update:
I called Matt at Arrow at the beginning of July about those incoming parts. He said they had been delayed until mid-September.

I had called various Atmel reps and distributors since posting this thread. One, Centaur, finally came through this week. We received two of these blighters in a puffy-bag. Yeah! I had no real assurances from them when I talked to them originally, so this was a distinct, but pleasant, surprise. Now the fun starts: our POS programmer doesn't burn these. EETools hasn't written a definition for these yet, but says they will do so cheerfully once we drop a grand on their latest programmer. Sure. Right. Uh huh. And here's your single-digit salute, guys...

Not a problem. I will bring in my Xeltek 3000U and we'll get on with it.

This little exercise suggests to me that Atmel's 8051-flavored chips are walking with the dinosaurs.

'Luck to you in your projects!
kenjj

 RE: SUCCESS! (an expansion)

That was Centaur North Inc. of Sunnyvale, CA (plug, plug, plug...8>)
kenjj

 been there, done that

EETools hasn't written a definition for these yet, but says they will do so cheerfully once we drop a grand on their latest programmer
had the exact same situation with Xeltek

I recoomend BP micro, they gave 2 youars notice on "update cessation" for programmers we have had for 10 years.

Erik