MCHC908QY1CDW versus MC68HC908QY1CDW

[dsweeney]

I was hoping that someone could tell me what the diffrence is between parts marked with MC68CH908.... and MCHC908... are?  The parts without the "68" are programmed correctly and the ones with the 68 seem to be all over the place with operation in our assemblies.

[bigmac]

Hello, and welcome to the forum.

You have actually placed this post in the wrong forum - the device that you refer is 8-bits.

When the part was first introduced, the full part number was MC68HC908QY1, with the following suffix letters representing the temperature range and package type.  There was also another version, the MC68HLC908QY1 that had some electrical differences.

Sometime later, an enhanced version was introduced, the MC68HC908QY1A (or A-suffix version).

Then subsequently Freescale dropped the "68HC" within all part numbers, without any other documented changes.

MC908QY1 is equivalent to MC68HC908QY1

MCL908YY1 is equivalent to MC68HLC908QY1

MC908QY1A is equivalent to MC68HC908QY1A

It is quite likely that code developed for the earlier device will still work on the A-suffix version.  However, It is possible that the code developed for the A-suffix version may not work properly on the earlier device, depending on whether any of the modified features are used.

Regards,

Mac

[dsweeney · Accepted solution]

Thank you very much for the response Bigmac!  Sorry for the 8bit and 16 bit confusion.  I think I need to be clearer on where the markings are...  The markings on the chip it's self are missing the 68 and I want to know what changed?  Are you saying that the parts marked MCHC908QY1CDW are in fact the newer version QY1A's?

[bigmac]

Hello,

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[email protected] wrote:

The markings on the chip it's self are missing the 68 and I want to know what changed?  Are you saying that the parts marked MCHC908QY1CDW are in fact the newer version QY1A's?

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I have seen package markings with 'MC68HC908' and with 'MC908', but I have not previously seen the marking 'MCHC908'.  An A-suffix device should have its package marked with the 'A' suffix, i.e. MC908QY1ACDW or MC908QY1ACDWE for lead-free package.

Regards,

Mac

'

[Lundin]

Freescale never types out 68 on the markings for the QY, like they do for some other 68HC08 parts.

Why? Because Freescale just love inconsistent chip markings. I don't think there exists a single Freescale chip with a printed partnumber on it, that is 100% corresponding to the documentation in the manual/erratas.