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
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
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
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
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.
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!
.. is the P89C669
You need check the datsheets to see if it will do (I think so)
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