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Altera_Forum's avatar
Altera_Forum
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14 years ago

Ballpark Figure for Current Draw

I'm looking to pick some regulators for my board and for that I need to figure out how much current my Max V CPLD's consume. I've used the Excel spreadsheet by Altera which helps in estimating ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

For a correct I/O current calculation, don't forget to check that the capacitive loading is reasonable. If it is set to 0pF then it will be underestimated. That said the current seems reasonable. If the pins must drive a low impedance, you must also take that into account.

Setting the IO standard to LVTTL 16mA doesn't mean that the component will always draw that much current, it is just the highest current sourced/sinked when changing the voltage level on the pin to charge/empty the load capacitance.