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Forum Post: Are high impedance clocks during powerup of TMS320C6678 really necessary?

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Hello,

I had to change the clock buffers on my board design and just realized they don't have a high-z output mode, only a static differential "off"  (P low, N high).


The datasheet specifies that the clocks must be high-z as the CVDD rail comes up, but since the clock inputs are AC/cap-coupled, is this really necessary?


I would simply change the part, but it is not convenient at this point.


Thanks
Tristan


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