ATMEGA2560-16U Yes, Not 16AU

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Hi, About a week ago I asked a chineese reseller 250 Atmega 2560 16AU and he shipped me ones marked with Atmega 2560 16U-TW with date codes 1745 45th week of 2017. When I asked him about the marking he told me that Microchip had changed it. I have tested most of the peripharals and they seem to be working fine. 

 

I created this thread to investigate the ICs and see if the Chineese reseller told me the truth. I have attached a photo of the IC.

 

P.S. I bouth the IC's for 5.56USD

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Are we supposed to be able to read what's on the chip?