Can I get a data sheet for the 25MHz MC68376BACFT25? Everything on line references 20MHz version but not 25MHz. It's in an old product but I have to do timing evaluation .

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Can I get a data sheet for the 25MHz MC68376BACFT25? Everything on line references 20MHz version but not 25MHz. It's in an old product but I have to do timing evaluation .

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mikebiggs
Contributor I

Can I get a data sheet for the 25MHz MC68376BACFT25? Everything on line references 20MHz version but not 25MHz. It's in an old product but I have to do timing evaluation .@@

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miduo
NXP Employee
NXP Employee

Understood! However NXP/FSL really do not have a datasheet dedicate for MC68376 25MHz. The 25MHz specs for the 336/376 do not exist. The way we handled it in the past was for the customer to look at the HC16Z3 25MHz part specs. They will be identical. These parts are of the same technology, shrink level, shared modules are of same revisions, tested identically, etc.....

Best Regards,

Fang

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miduo
NXP Employee
NXP Employee

Hi,

Please be note that the MC68376 data sheet for the 20MHz version also applies to the 25MHz version. The only difference is the 25MHz passed production tests at a higher clock speed.

For more clarify, MC68376 20MHz devices are qualified at this freq. The 20MHz have parameterized and guaranteed to work up to this freq. If you are using the 20MHz version exceed 20MHz we can not guarantee proper operation. Actually there is no difference between the 20MHz and 25MHz devices, except the 25MHz have been qualified at this higher freq. The 20MHz devices have only been qualified up to 20MHz, and will probably not work at 25MHz. If you need to use the 25MHz devices working at 20MHz, you will only need to change the freq. of the device in software and maybe the external crystal/ext. osc.

I don't have the complete testing process but in a nutshell the devices are tested over the entire temp. rating of the device. There are no specific reasons why a device would be 20MHz and not 25MHz other than not being able to meet all of the timing requirements over the entire operating environment. They could fail due to things like bus timing, PLL, ADC, etc.

As stated above there are no specific failure modes. If they don't meet any of the electrical specifications for the 25MHz they will be tested at 20MHz. Generally the normal testing procedure would start at 25MHz down to 20MHz. The 25 MHz failures are then tested at 20MHz.

Best Regards,

Fang

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TomE
Specialist I

Given the part has demonstrated (probably in later production) that it is capable of 25MHz operation, I would have expected an updated Data Sheet or an Errata item to list the tighter timing parameters that can be expected of the 25MHz parts.

The 20MHz Data Sheet says the maximum frequency is 20.97MHz. There are a whole lot of timing and sample-and-hold parameters that would have to change for 25MHz operation. That's what the customer wants to look through.

Maybe there was a document, but it has been misplaced.

Various suppliers have copies of the user manual on line. For instance Elcodis has one titled "SC68376BGVAB25R PDF​", which looks promising. Until you download it and find it is an unversioned one dated 1996. The one on NXP's site is at least a version from 2000.

Here's a post from 1999 stating that the 25MHz 376 had been released - a year prior to the latest version of the User Manual. It is surprising that the 2000 version of the User manual didn't document the chip they'd already been shipping for a year or more. The post does give other examples of late documentation and web site updates though.

http://www.verycomputer.com/154_2df046deb1dc0172_1.htm

Tom

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TomE
Specialist I

There's two of you asking the same question.

Tricky one.

I did find that the "MC68F375 Reference manual (Rev 25)" does have an Electrical section that goes up to 33MHz:

http://www.nxp.com/products/microcontrollers-and-processors/more-processors/coldfire-plus-coldfire-m...

(Edit): Oops, that "375" which is different to "376".

Tom

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