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'16C74 or 16C74A - how to tell the difference?'
1997\01\19@073431 by Jim Main

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Is the 16C74A chip marked on the chip as such?

I remember someone in here saying that all '74's were now the 74A
version - but how do you actually tell the difference if it's not marked
on the chip?

To add to the confusion there's 'REV A' versions in both cases  - so
does anyone have a definitive answer for all the varieties available?
--
Jim Main
spam_OUTjimTakeThisOuTspamewcomm.demon.co.uk

1997\01\19@143309 by John Dammeyer

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At 12:17 PM 19/01/1997 +0000, you wrote:
>Is the 16C74A chip marked on the chip as such?
>
>I remember someone in here saying that all '74's were now the 74A
>version - but how do you actually tell the difference if it's not marked
>on the chip?

The difference is that the 74A has brownout protection.  ie: if a reset
occurs due to a power brownout a status bit is set.  The standard '74
doesn't have this feature.  Watch out too for certain prom/micro
programmers.  ICE Technologies has decided not to support the '74A on their
MM1000.  If you are in the market for a new programmer I'd get some sort of
statement stating how long they will support new devices - if they upgrade
at all.

John.

>
>To add to the confusion there's 'REV A' versions in both cases  - so
>does anyone have a definitive answer for all the varieties available?
>--
>Jim Main
>.....jimKILLspamspam@spam@ewcomm.demon.co.uk
>
>
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1997\01\19@162343 by fastfwd

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Jim Main <PICLISTspamKILLspamMITVMA.MIT.EDU> wrote:

> Is the 16C74A chip marked on the chip as such?

   Yes.

> To add to the confusion there's 'REV A' versions in both cases  - so
> does anyone have a definitive answer for all the varieties
> available?

   The 16C74s are marked "16C74".  The 16C74As are marked "16C74A".

   Following that base part-number designation is (for all parts
   except the "non-A" 16C5x parts) a two-digit number representing
   the maximum clock speed in MHz, and a package-type code (JW =
   windowed, P = plastic DIP, SP = plastic skinny-DIP, SO = SOIC,
   SS = SSOP, etc.).

   Following THAT is a 4-digit datecode (first two digits = year,
   last two = week).

   The datecode is followed by a three-letter code ("CBA", "SAT",
   etc.). The MIDDLE letter is the silicon revision letter; the
   other two identify the origin of the die and the packaging.

   -Andy

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