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Re: [avr-chat] Differences between ATmega1284 and P version?

From: Rick Mann
Subject: Re: [avr-chat] Differences between ATmega1284 and P version?
Date: Tue, 8 Feb 2011 14:34:31 -0800

Thanks. Looking at the 644A data sheet (which encompasses the 1284[P]), there's 
no difference in the typical characteristics between letter variants of a 
particular processor memory size. There is a very small difference in the "max" 
values for power consumption.

On Feb 8, 2011, at 14:02:49, Ruud Vlaming wrote:

> On Tuesday 08 February 2011, Rick Mann wrote:
>> I'm working with the ATmega644A, and I like it, but I could use more memory.
>> So I'm looking at the 1284, which comes in a P variant, 
>> but no A variant.  I can't figure out what the differences among all 
>> these variants are. The 644A comes in a PA variant as well. 
> Indeed this P/A business can be confusing. For most chips the
> only difference between P en non P is the power consumption
> and the possibilty to operate the chips at lower voltages.
> A or non A makes much less a difference, usually only
> small differences in electrical characteristics. For example:
> 1284P : V_OLmax (Vcc=5V) 0.7V
> 644PA:  V_OLmax  (Vcc=5V) 0.9V
> i cannot find the datasheet of the 644A, so i have no
> real comparrisson at the moment. 
> My guess is however that you should be save if you
> replace an ATmega644A with an ATmega644PA
> or with an ATmega1284P for that matter.
> I would in general not replace it the other way around.
> One other point of attention: the ATmega1284P used to
> have some availability problems, but maybe this is
> history by now.
> Hope this helps.
> Ruud
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