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Altera_Forum's avatar
Altera_Forum
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16 years ago

MAX II(EPM570) drive output

Hello, My question is what is the maximum driver current of EPM570 device? On our boards, we use EPM570 as an alternative of 74LCX16245/244 to buffer CPU data/address bus and drives device...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

As you can see from the datasheet, MAX II supports output programmable drive strength, you can set it to maximum (16 mA for LVTTL) or minimum (8 mA). Maximum is set by default for all pins, if no additional Quartus settings are present. You can change the settings individually e.g. in Quartus Pin Planner.

The question is however, if you actually verified the drive strength beeing too weak? It may be the opposite case of causing stronger reflections by a too high drive strength and/or faster edges. This can't be determined without real measurements, I fear.