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Question about MAX3421e

Category: Hardware

I have brought some MAX3421e from an online store. But I found them didn't work. Finally, I found the oscillator(12Mhz) didn't work.

And after I replaced with MAX3421e chips  from another online store, it works.

In the datasheet of MAX3421e , the EP should be like below:

But the one which can't work is as below (it's square):

And the EP of the one which works well is as below

My question is:have you even produce a MAX3421e with square EP? Does it means I have brought fake IC?