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'16F84 minimum Vcc at full speed'
1998\04\03@035828 by Russell McMahon

picon face
I got no bites on this so I'll try again (and if that
doesn't work I'll download the 120 page (no doubt) PDF from
Microchip :-) )

Can anyone with a more up to date data book than mine tell
me the minimum allowable Vcc for a 16F84-04 at 4 MHz. For
that matter, can you run a 10 MHz part faster at the same
minimum Vcc? (I doubt it but stranger things have happened).

1998\04\04@175404 by Steve Baldwin

flavicon
face
> I got no bites on this so I'll try again (and if that
> doesn't work I'll download the 120 page (no doubt) PDF from
> Microchip :-) )
>
> Can anyone with a more up to date data book than mine tell
> me the minimum allowable Vcc for a 16F84-04 at 4 MHz. For
> that matter, can you run a 10 MHz part faster at the same
> minimum Vcc? (I doubt it but stranger things have happened).

Good guess on the data sheet size. 122 pages as a PDF file.

The '97 (2nd Ed) CDROM still has the '96 preliminary data sheet. The
front page says 2-6V operation but all the specs at the end have
Vcc min of 4.0V.

There is just a minimum voltage for the oscillator type. 4.5V for HS
and 4.0V for XT, RP, LC.

Check the date of the web site copy. It might be later.

Steve.
======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: spam_OUTstevebTakeThisOuTspamtla.co.nz      fax +64 9 820-1929
======================================================

1998\04\04@195134 by mtt

flavicon
face
> >
> > Can anyone with a more up to date data book than mine tell
> > me the minimum allowable Vcc for a 16F84-04 at 4 MHz.

Not sure if this is relevant, when I tried to run 16F84-04 at 455kHz at
various voltages, it did not function properly at Vdd=3.0 volts and
lower.

Regards,

Mike DeLong

Microelectronic Technologies(Thailand) Co., Ltd.

1998\04\04@201909 by Russell McMahon

picon face
  Steve

Thanks.
I downloaded the PDF yesterday (even longer again, 1.35MB)
and as you say they say 2v on the front page but 4v minimum
inside. The web datasheet is dated 1998 but still has
'PRELIMINARY" across the specification pages. I would have
hoped that Microchip had worked out the true specs by now
:-). Seriously though, I'm going to have to ask them - for a
designer to use a part seriously one MUST know the worst
case specs and the difference between and implications of 4v
and 2v operation are extreme.

That said, I'm running 2 samples at 3 volts and they start
and run very well. Whether this can be guaranteed in
production quantities is another story.

ANYONE ELSE:     What is the lowest voltage that anyone has
successfully used the 16F84 at in other than 1 off designs?

From: Steve Baldwin <.....stevebKILLspamspam@spam@KCBBS.GEN.NZ>
Subject: Re: 16F84 minimum Vcc at full speed


> Can anyone with a more up to date data book than mine tell
> me the minimum allowable Vcc for a 16F84-04 at 4 MHz. For
> that matter, can you run a 10 MHz part faster at the same
> minimum Vcc? (I doubt it but stranger things have
happened).

The '97 (2nd Ed) CDROM still has the '96 preliminary data
sheet. The
front page says 2-6V operation but all the specs at the end
have
Vcc min of 4.0V.

There is just a minimum voltage for the oscillator type.
4.5V for HS
and 4.0V for XT, RP, LC.

1998\04\04@221130 by Mike Keitz

picon face
On Sun, 5 Apr 1998 13:16:21 +1200 Russell McMahon <apptechspamKILLspamclear.net.nz>
writes:
>   Steve
>
>Thanks.
>I downloaded the PDF yesterday (even longer again, 1.35MB)
>and as you say they say 2v on the front page but 4v minimum
>inside.

I'm looking at the data from the 1996 CD.  There is a "PIC16LF84" rated
for 2.0V to 6.0V Vdd.  The maximum crystal clock rate is 2 MHz.  Table
11-1 is a handy comparison of the 3 versions of the chip in terms of
frequency and voltage ratings.

Digi-Key lists the LF part with the other PIC16F84's.  The price is
slightly more than that of a PIC16F84-04 but less than a PIC16F84-10.  To
add further confusion, the full part number is PIC16LF84-04 ?!  I assume
that means the part will work up to 4 MHz, but for between 2 and 4 MHz,
Vdd must be 4.0V.

>That said, I'm running 2 samples at 3 volts and they start
>and run very well. Whether this can be guaranteed in
>production quantities is another story.
>
>ANYONE ELSE:     What is the lowest voltage that anyone has
>successfully used the 16F84 at in other than 1 off designs?

I think you should use LF84's, as they are tested for low voltage.  They
may work better at 3V and 4 MHz than ordinary ones.  If you can, lower
the frequency to 2 MHz and then everything is completely in spec.

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