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Hi Adam -
There is no hard limit, but the more load capacitance the slower the output signal will transition. If you're in no hurry you can put as much load capacitance out there as you like. For some interfaces, like I2C, the standard specifies a maximum total bus capacitance in order to operate at the specified speed. But even then, if you slow down there is no limit on bus capacitance.
What are you trying to do?
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I want to use TVS diode arrays to protect the IO pins of my Cyclone V from ESD. The application of the IOs is pretty general, as the overall board will be an FPGA control board.
The maximum frequency of the IOs is around 100 MHz. What maximum capacitance can I drive at 100 MHz?
The diode arrays I've taken into consideration have a capacitance ranging from 5 pF to 15 pF.
Thanks!
Cheers,
Adam
Honored Contributor
