kenasw@btinternet.com wrote :

> It is better if this device could work from 3V as well, but the
> strange thing is that in the data sheet it actually reads
> 
> maximum ratings:
> supply voltage: -0.3v to +6V
> 
> This is very strange, as it would suggest that 0V is a permitted
> supply, i.e. it will work with no supply voltage????

I can't see any ":-)", but you *must* be joking, right ? :-)

Can you point out where they say that that the device will
actualy "work" at 0V ? No, you can't.

On the other hand, they say in a footnote to the "Absolute
Maximum Ratings" table, that :

"These are stress ratings only, and functional operation of
the device at these or any other conditions beyond those
indicated in the operational sections of the specifications
is not implied."

Pefectly clear, IMHO.

Read "Operating Supply Voltage" on page 3.
(Well, maybe better to read it all... :-) )

Best Regards,
Jan-Erik.

> here is the datasheet
> 
> http://pdfserv.maxim-ic.com/en/ds/MAX220-MAX249.pdf
> -- 



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