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337 Views
Registered: ‎04-10-2019

Artix 7 input impedance

Hi,

 

I'm looking for infomation regarding input impedance for general I/O pins of the Artix 7 FPGA.  I have been unable to locate the information in the documentation.  I'm looking for a specific value.

 

Thanks

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1 Reply
329 Views
Registered: ‎09-17-2018

Re: Artix 7 input impedance

Impedance,

Is not a good term to use with a CMOS device input, as the input is primarily a capacitor, with infinite resistance (impedance at DC).  IBIS models are used to represent the diode input protection structure, any series inductance, etc.

Worst case leakage will dominate the impedance at low frequencies.  The input capacitance will dominate the impedance at high frequencies.  Leakage is in the data sheet.

Finally, any weak pullup, or pulldown adds a resistance to the input (also in the data seet).

l.e.o.