Re: 89C51ED2

Sep 06, 2008 4 Replies


Jamie wrote:


>> Joerg wrote:
>>> Jamie wrote:
>>>
>>>> Joerg wrote:
>>>>
>>>>> TT_Man wrote:
>>>>>
>>>>>> ">> Is this an Atmel part?
>>>>>>
>>>>>>>> If so, I would check the datasheets for updates.
>>>>>>>> I know on their 8252/3 series, they made a change to the crystal cap
>>>>>>>> requirements.
>>>>>>>> Went from 30pf to around 5pf. Would occasionally cause improper
>>>>>>>> startup/reset, and very slow operation if it did reset. If they
>>>>>>>> changed the oscillator on ED2, that could very well be the problem.
>>>>>>>> (?)
>>>>>>>>
>>>>>>> Hopefully not without changing the rev level and informing their
>>>>>>> customers? Yikes, I sure hope not.
>>>>>>>
>>>>>>> --
>>>>>>> Regards, Joerg
>>>>>>
>>>>>>
>>>>>>
>>>>>> Joerg, I get regular updates on all atmel processor revision
>>>>>> changes/data sheet spec changes, . In this respect, Atmel are 100%
>>>>>> on the ball.
>>>>>> AFAIK there have been none for this particular part......
>>>>>
>>>>>
>>>>>
>>>>> That's good. I'd call them anyhow though. I once had an issue with
>>>>> them regarding an 89C51 that was advertized at a higher clock than
>>>>> it could do. IIRC it was touted as 16MHz but I could only get it to
>>>>> run at 12MHz. They did apologize and other than that it ran in that
>>>>> same design forever. In fact, it's still in production, over a
>>>>> decade now. That's the beauty of 8051 designs, those things are like
>>>>> the VW Beetle.
>>>>>
>>>> Thats not true. My bosses VW bug finally s*it the bed not to long
>>>> ago! :)
>>>>
>>>
>>> Yeah, but how old was it by then?
>>>
>> Ok, its a 1968 :)
>>
>> Guess that last side collision he had didn't
>> do the under structure to good! :)
>>
>
>Well! 40 years is a respectable life for a car.

It certainly is. Question: Are there any current electronic parts, resistors, capacitors, inductors, diodes, transistors or ICs that have been available for 40 years.

[snip]

Sure. Lansdale...

formatting link

Still makes the MC1530/31 OpAmp I designed in 1964.

They also make other Motorola designs of mine, but I can't find them. They used to have a simple page listing analog parts, now they've gone modern, with frames and other crap :-(

...Jim Thompson

| James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Liberals are so ignorant... They don\'t even know the definition of ignorant

Tons of them. I design with them every day. LM324, 2N2222, 2N3904, uA-whatever, LM331, LM339 and so on.

Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.

I was going to say the LM741

formatting link
"

That one's pretty much out to pasture now. Although Digikey still has lots of them and they were ported to SOIC.

Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required