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Altera_Forum
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15 years ago

question about IO status while power up for MAX II EPM1270

for MAX II EPM1270 For the weak pull-up resistor during power up,IO will show a high voltage(3.3V).I want to make IO show a low voltage by adding a pull-down resistor.what is the appropriate resis...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Please do not multipost your question.

The datasheet should give you the lowest possible value for the weak pull-up in the Max II. When you add a pull down you create a resistor divider, and depending on the voltage you want to reach (<0.8V for a TTL signal, as an example) it will give you the highest possible value for the pull down.