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'[PIC]: 16f84 v 16f84a'
2001\07\27@095630 by Dave

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Hey,

I asked about some 16f84's at a shop a bit ago and they told me they were no
longer in production but a 16f84a version is available. I haven't had time
to properly look through the 16f84a's data sheets yet but want to know the
main differences. The only difference I know is that a 20MHz version is
available, where I believe a 10MHz was the max for the non A one.

One main issue though, Is it exactly the same to write the program to it? (I
use my own software to program it)

Thanks again.
Regards,

David Stubbs

WEB: http://www.nti-uk.com
TEL UK: 07968 397782

 {Original Message removed}

2001\07\27@135507 by Byron A Jeff

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On Fri, Jul 27, 2001 at 02:55:36PM +0100, David Stubbs wrote:
> Hey,
>
> I asked about some 16f84's at a shop a bit ago and they told me they were no
> longer in production but a 16f84a version is available. I haven't had time
> to properly look through the 16f84a's data sheets yet but want to know the
> main differences. The only difference I know is that a 20MHz version is
> available, where I believe a 10MHz was the max for the non A one.
>
> One main issue though, Is it exactly the same to write the program to it? (I
> use my own software to program it)

Just a friendly piece of advise on the subject. Don't use the 16F84a parts.
Microchip is clearly trying to put them into an end of life state.

The alternative is the 16F628. Readily available at Digikey. Here's the scoop.

- Twice the program memory
- Three times the data memory
- three timers vs. 1 for the 16F84a
- two comparators vs. 0 for the 16F84a
- twice the data eeprom memory
- hardware USART
- up to 3 extra I/O pins.
- 4 Mhz internal osciallator.
- Runs up to 20 Mhz.
- Can be low voltate programmed.

And you get this all at 2/3 the price of a 16f84a. That's right. The part
costs a lot less. At digikey the 16f84a is $6.00. The 16F628 is $3.88 in the
20 Mhz version.

The parts are both pin and programming compatible. Be sure to check for any
differences in the config word though.

Considering that you get a whole bunch more for a whole lot less, I can't see
any reason to purchase 16F84a parts anymore. And considering the pricing, I'm
pretty sure that's what Microchip expects.

BAJ

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2001\07\27@143303 by Jeff DeMaagd

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Darn, I should have ordered them.  I didn't notice them at all, they would
greatly aid my project, particularly with the internal RC (two less parts)
plus a bit more I/O.

Jeff

{Original Message removed}

2001\07\27@195613 by Dave

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Hmm,

I'd have to alter my programmer to use the extra memory.

Also DigiKey is a US company. I do not know of a good UK company. The
company I currently use don't have a big variety of products. Shame really.
The Pic16f628/04p is 5 pence cheaper than the 16f84 at my place. They also
do not sell a 20MHz version. That's a shame really as I could really do with
a 20MHz version.

I'll check out the data sheet about the config word. Thanks for the help
though. Much appreciated.

Regards,

David Stubbs

WEB: http://www.nti-uk.com
TEL UK: 07968 397782


> {Original Message removed}

2001\07\27@201147 by Quentin

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Maybe I can help you from the other side of the world. Somebody
mentioned a few posts ago to try Avnet in the UK. I use Avnet here in SA
and get just about the whole range from them.

Quentin

David Stubbs wrote:
{Quote hidden}

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2001\07\28@202734 by Anders_Mejl=E6nder_Jakhelln?=

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Nice to know. I asked for the the 16F84A, and ELFA in Norway told me they would make it available late this year!!! :-)))

{Original Message removed}

2001\07\30@035454 by Alan B. Pearce

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www.pic-chips.com/
is a section of Crownhill, and list several variants of the 16F627 and 8.
They also have the best prices I can recall seeing in the UK.

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