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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
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13 years ago

So here's an odd follow-up question:

The figures on page 19 specify either TTL or LVCMOS/LVTTL, assuming that VCCIO is 3.0 volts or thereabouts. For an all 5-volt system interfacing to CMOS, which one should I select under the device settings? TTL or LVCMOS/LVTTL? Both seem to work fine but neither seems to be right :-)

-Mux