whats the difference between MC68LC302AF20CT and MC68LC302AF20VCT

[js4star]

whats the difference between MC68LC302AF20CT and MC68LC302AF20VCT

[TomE]

Here's a table of 29 different "302" versions out of a total of 82 from 2012:

https://web.archive.org/web/20121002224302/http://www.freescale.com/webapp/sps/site/prod_summary.jsp...

That doesn't even list the "EN" and other variants. Nothing I can get to from there decodes the letters.

But from there I found a reference to "PCN5792" (7 Aug 2000) here:

https://www.nxp.com/docs/en/product-change-notice/PCN5792.pdf

MC68LC302PU20VCT 68LC302 TQFP 3.3V 20MHz
MC68LC302PU20CT 68LC302 TQFP 5.0V 20MHZ

So that says "VCT" is 3.3V and "CT" is 5.0V. Also that "The 'CT' part numbers
reflect that die can be sourced from either TSC8 or MOS11".

This current manual has a section at the end detailing "B" suffix is 5V and "VB" suffix is 3.3V:

https://www.nxp.com/docs/en/reference-manual/MC68LC302RM_AD.pdf

That also lists the high and low "VDD" limits for the 3.3V and 5V Parts.

So that's what the difference is.

This is detailed in the MC68LC302 Reference Manual (above) and in the Data Sheet:

https://www.nxp.com/docs/en/data-sheet/MC68LC302.pdf

Tom

[TomE]

I've been searching for an answer to this since you posted. I haven't been able to turn up anything on NXP's site. I've even tried to use archive.org to look at the Freescale and Motorola sites without any success.

As far as I can tell, the "AF" is the package and pin type (and all of the data sheets are so old they only mention the pin-grid-array and original PQFP ("PU") designations. The "20" is the frequency. The "CT" and "VCT" I can't find anything on. Some part of them may be the temperature range.

Does anyone at NXP have a decoder for these part numbers?

Tom