I have had some problems with 'F' parts @ 3.3V, erratic programming
failures, but they ran fine.  Circuit cellar 2002 had a smartmedia
article that ran an 'F' @ 3.3V, the author said nothing about how this
is contrary to datasheet spec.  Personally I spend the extra $1 for the LF.

J

Michael Rigby-Jones wrote:
>>-----Original Message-----
>>From: Hulatt, Jon [mailto:jhulatt@MONSTEREUROPE.COM]
>>Sent: 13 April 2004 15:40
>>To: PICLIST@MITVMA.MIT.EDU
>>Subject: Re: [PIC:] 18F452 / 18LF452
>>
>>
>>
>>>I asked my FAE about this sometime ago, and ISTR the specs
>>
>>are exactly
>>
>>>the same on the F and LF when operating at 5volts, but the
>>
>>spec's had
>>
>>>to be relaxed for working at low voltages, (i.e. if you stick to the
>>>conditions shown for the F part in the table, the LF should
>>
>>meet those
>>
>>>specs when run at 5 volts).
>>>
>>
>>Do we therefore think it likely that the ~LF parts are not
>>physically different to the ~F parts, but just turn out to be
>>the best of the bunch?
>>
>>A la Intel testing cpus and speed grading accordingly?
>>
>>It's an out of interest thing; please noone jump on my back
>>saying I shouldn't run a pic out of spec etc etc. :)
>
>
> Very probably.  I have (accidently) run non-LF parts at 3.3volts with no
> problems at all. YYMV etc.
>
> Regards
>
> Mike
>
>
>
>
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