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Altera_Forum's avatar
Altera_Forum
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13 years ago

interfacing Flex10k10 to CMOS

Hi There! Bit of a dumb question but can I directly interface a 10k10 to a 5v CMOS device or do I need to use pull-ups? From what I can tell it outputs *just* above 3.5v (on a 5v core/IO voltag...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

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Bit of a dumb question but can I directly interface a 10k10 to a 5v CMOS device or do I need to use pull-ups? From what I can tell it outputs *just* above 3.5v (on a 5v core/IO voltage) so it should be okay, right?

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Did you read the datasheet throughly? Flex10k outputs driving CMOS (effectively zero Ioh) have full CMOS swing (Voh > 4.0V).