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There is a long list of tests in a manufacturing test. The general answer to your question is that devices must be screened for any defect occurring during the manufacturing process, as well as any intolerable variation in the process parameters.
In order to do that you have to have tests with good fault coverage (like ATPG for digital devices), some sort of at-speed testing (scan or functional), and measurement of all parametric specs (analog devices and I/Os). Some sort of current testing is also a good idea...
I heard that alot of power test is done onces the chip is manufactured
well its very good question.... i will get you some more answers after talking to one of the know vendor
an-other things i heard is that even vibration and enviromental test was done for one of the defence and space client....
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