From: Spehro Pefhany
Subject: Re: PIC experts opinions please.
X-Newsreader: Forte Agent 1.92/32.572
Date: Tue, 10 Dec 2002 15:29:47 GMT
NNTP-Posting-Date: Tue, 10 Dec 2002 10:29:47 EST
On 10 Dec 2002 14:42:00 GMT, the renowned email@example.com
>We have a product that uses a PIC16C73B. The powers that be want it updating
>and a few extra features adding. The current PIC will do these happily but I've
>heard rumours that it will be obsoleted soon.
>Any one know of any truth in this ?
I doubt it will happen real soon, Microchip did transition to the 'B'
die shrink on this series. They are pushing the FLASH parts though.
>We have to do a new PCB anyway.
>Should we move to another later PIC just to be certain ? If so what would you
>recommend. The 16C73B is using every analogue input and we have one spare i/o
>so whatever else we use must have at least the same i/os
These should be drop-in (or very close) replacements.
16F73 14 bit architecture (same) no real improvements except
16F873 14 bit architecture (same) 10 bit ADC, EEPROM, can read
its own code memory, ISP, ICD
18F252 more code memory (32K bytes vs. 7K), EEPROM, 10 bit ADC,
16 bit architecture, (requires code changes), 40MHz, ISP, ICD
I suggest you try your best to add ICD or at least ISP, which
translates to a small connector and maybe a bit of added circuitry on
your PCB. You should reconsider your production process in light
of ISP to see if you should change the PIC package type etc.
Digikey's 100 pcs pricing, for reference (USD):
16F73: 3.18 20MHz
16C73: 4.03 4MHz, 4.32 20MHz
16F873 4.63 4MHz, 4.95 20MHz
18F252: 5.07 40MHz
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