New ContributorHi,
I need to include the 100R resistor we are using connected to RZQ pin D21 on the 484 ball package.
Can anyone tell me what the maximum current I would realistically experience. If I just assumed that the resistor connected directly from a voltage rail through the resistor to ground it would make my resistor too large, physically, thus the need for realistic figures please.
Thanks.
Regular ContributorHi,
Through my knowledge, Altera does not publish a maximum current through the RZQ pin or a required resistor wattage. Based on the intended function, the current is small, and a standard low-wattage precision resistor is typically sufficient.
Thank you.
New ContributorThanks, but the problem is that I need to have a figure for my derating. I can't just make up a number, with respect. I do think that Altera should be able to provide this information.
Super ContributorHi,
different FPGA families have calibration blocks with different properties. Cyclone 10 LP e.g. has separate Rup/Rdn and specifies that the applied voltage during calibration can be up to VCCIO (90 mW/100 ohm at highest VCCIO of 3V). But calibration completes in about 100 us, considering chip resistor time constant > 1 ms, there will be a huge power margin even for small 63 mW 0402. Cyclone V may apply lower maximal voltage to RZQ, but if not, I don't expect problems.
New ContributorThanks FvM.
I have used your answer for now but I will leave the question open for now.
