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'[PIC]: Which 18F877'
2001\03\27@171037 by Raymond Choat

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I am going to try programming a 18f877
but I go to microchip.com and it has all these:

PIC16F877-20I/L 14.36
PIC16F877-20I/PQ 19.14
PIC16LF877-04I/P 12.58
PIC16F877-04/L 12.20
PIC16F877-20I/P 12.82
PIC16F877-20I/PT 17.32
PIC16LF877-04I/L 14.10
PIC16LF877-04I/PQ 15.98
PIC16F877-20/PT 15.74
PIC16F877-04/P 10.90
PIC16LF877-04I/PT 17.00

I understand what the 04 or 20 mean (Mhz) but I have no idea on the rest.
So which do I buy?
Any suggestions for a project I am trying to build (Sharpening machine)?
Any place to get these chips cheaper?

Thanks Wrong Way Ray

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2001\03\27@172322 by Randy Glenn

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If you're breadboarding, you'll want the DIP package - /P

The other characters designate the temperature range, etc. I think
they're listed in the 16F877 datasheet. It might also be a good idea
to get ahold of a recent Microchip product lineup card.

- -Randy Glenn

If you have to ship styrofoam, what DO you pack it in?
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- {Original Message removed}

2001\03\27@172717 by Rick Mann

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on 3/27/01 2:10 PM, Raymond Choat at .....rcKILLspamspam@spam@KENAI.NET wrote:

> I understand what the 04 or 20 mean (Mhz) but I have no idea on the rest.
> So which do I buy?
> Any suggestions for a project I am trying to build (Sharpening machine)?
> Any place to get these chips cheaper?

I indicates the temperature range (Industrial, I think). You can get I or
non-I.

L, PQ, P, PT all refer to the package. If you look in the 16F877 data sheet,
toward the end there is an appendix that shows the different package types.
I don't know what they are off the top of my head. The main differences are
DIP vs. quad flat packs. I prefer the quad flat packs for surface mount
work, but the DIP is easiest to prototype with.

You might find some of the chips at http://www.digikey.com/ for less, but
they seem to be out of stock on a lot of parts.

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2001\03\27@173412 by Glenn Mitchell

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Near the end of the 18f877 datasheet is the Product Description System page.
This will show the differences between them.
Glenn Mitchell.

{Original Message removed}

2001\03\27@181813 by M. Adam Davis

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I generally get mine from DigiKey or Peter Anderson.  You'll find out
what those symbols mean on the data sheet (last few pages).  Since I
have mine handy...

PartNumber-FF T /PK PPP

PartNumber = Part Number
FF = Frequency (04 = 4MHz, 20 = 20MHz)
T = Temperature Range
   b = Commercial 0C to 70C (assumed if blank)
   I = Industrial -40C to 85C
PK = Package
    PQ = MQFP (Metric Quad Flat Pack)
    PT = TQFP (Thin ...)
    SO = SOIC (Small Outline IC, surface mount)
    SP = Skinny Plastic DIP
    P  = PDIP (Plastic Dual Inline Package)
    L  = PLCC (Plastic Leaded Chip Carrier)
PPP = Pattern, Generally used to note mask (factory) programming

Chances are you'll want to stick with the P (PDIP) for prototyping
(breadboarding, etc).  You can also find all the package dimensions on
the microchip website.

-Adam


Raymond Choat wrote:
{Quote hidden}

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2001\03\27@202501 by David P. Harris

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Hi-
Peter Anderson's website is :  http://www.phanderson.com
'tis a good site.
David

"M. Adam Davis" wrote:

{Quote hidden}

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2001\03\27@210657 by Olin Lathrop

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> PIC16F877-20I/L 14.36
> PIC16F877-20I/PQ 19.14
> PIC16LF877-04I/P 12.58
> PIC16F877-04/L 12.20
> PIC16F877-20I/P 12.82
> PIC16F877-20I/PT 17.32
> PIC16LF877-04I/L 14.10
> PIC16LF877-04I/PQ 15.98
> PIC16F877-20/PT 15.74
> PIC16F877-04/P 10.90
> PIC16LF877-04I/PT 17.00
>
> I understand what the 04 or 20 mean (Mhz) but I have no idea on the rest.
> So which do I buy?

You are right, the first number is the max speed in MHz.  The "I" before the
slash denotes the industrial temperature range.  This is -40C to 85C whereas
no character denotes the commercial temperature range, 0C to 70C.  The L,
PQ, PT, and P denote the package.  L = plastic leaded chip carrier (PLCC),
PQ = plastic quad flatpack (PQFP), PT = plastic thin quad flatpack (TQFP), P
= plastic DIP.

If this is a one off or small quantities for prototyping, I would get the
20MHz version, commercial temperature range unless you need better, and
either the DIP or PLCC package.  You can get sockets for these two packages,
whereas the others are suface mount.  The DIP package will be easier to
handle and the sockets will be cheaper.

By the way, these prices seem outrageous.  I haven't looked, but I bet even
DigiKey has them for less.


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Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, RemoveMEolinTakeThisOuTspamembedinc.com, http://www.embedinc.com

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2001\03\27@222218 by Bob Ammerman

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----- Original Message -----
From: Raymond Choat <TakeThisOuTrcEraseMEspamspam_OUTKENAI.NET>
To: <RemoveMEPICLISTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: Tuesday, March 27, 2001 5:10 PM
Subject: Re: [PIC]: Which 18F877


{Quote hidden}

The 'I' means 'industrial temperature range'

The '/XX' defines the package type.

The 'LF' says it is capable of running at low voltage.

> Any suggestions for a project I am trying to build (Sharpening machine)?
> Any place to get these chips cheaper?

Much cheaper, many places. Microchip.com is intended to serve as a
convenient place to get chips in onesies-twosies, sometimes before they are
stocked by the average distributor.

I often buy from Digikey.com

> Thanks Wrong Way Ray
>
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