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How to decipher part numbers?



Hello!

At http://www.ti.com/product/tms320c6670 in Buy section there several option available. Currently 4 distributors listed with stock available. I see options for TMS320C6670ACYP2, TMS320C6670ACYPA2, TMS320C6670AXCYP2 and TMS320C6670AXCYPA2. I know what TMS320 is, I know what C6670 is, but what is a meaning of suffixes? Looking in Package|Pins column I can guess CYP is a part of package type. Next looking at temperature rating I conclude that last A in the suffix is extended, industrial temperature rating. But what is a meaning of the other elements?

Please point me where to read.