AVR-Chat

Hi Stefan, 
I couldn't have a look at the chips at atmel (atmel pdfs just don't show
up on my browser)  but as far as I know  they are not 8 pin devices, but
they are cool as well I will consider thank you.

And Hi Ivan, most microcontrollers today have schmitt triggered inputs
and they accept about 1.5V and above as high level ( values may be
changing) 
 so 3.3 V flash data output is enough to capture high value, 
For dataflash inputs, putting a 5K resistor between micro's output pin
and flash input pin is enough (5-3.3)/1k supplies  ~0.3mA  and it does
not destroy flashinput pin (which normally has a high impedance and
doesn't draw any current  at all till above 3.3V) 
Above 3.3 V input protection diodes of the flash will keep voltage at
3.3 level.



-----Original Message-----
From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On
Behalf Of Ivan Vernot
Sent: Thursday, September 01, 2005 2:40 AM
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] Re: Serial Flash


Stefan,
When you say '5V tolerant' I understand that a micro (@5V) can write to
the 
Flash (@3.3v).
But what do you do for the data coming OUT of the data flash?  So you
just 
use a pull-up resistor, or something else?

Ivan.
----- Original Message ----- 
From: "Stefan Wimmer" <yahoo@wsw-elektronik.de>
To: <AVR-Chat@yahoogroups.com>
Sent: Thursday, September 01, 2005 2:51 AM
Subject: [AVR-Chat] Re: Serial Flash


> --- In AVR-Chat@yahoogroups.com, "Arif YILMAZ" <arif.yilmaz@b...> 
> wrote:
>> hello  dear members,
>> i need a high capacity serial flash chip and i will use the following

>> from ST ,
>>
>> http://www.st.com/stonline/products/literature/ds/10980/m25pe40.htm
>>
>>  but it is 3.3 V
>>
>> do you know any other alternative for this serial flash memory about 
>> 512K flash with SPI interface and 5V supply?
>
> Hi Arif,
>
> I'm using the dataflashs from Atmel in some applications. They're 3.3V

> too, but fully 5V-tolerant at the I/Os. A small LDO like 
> LP2950/2980/2985 for the 3.3V and you're done...
>
> Stefan
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
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>
>
> 




 
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