Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

3.3 V Output needed from Cyclone III Starter Kit

Here is a simple question: q: how do i generate a 3.3 v level digital output from my cyclone iii starter kit ? i setup the following experiment: 1) I wrote a simple code to transfer a di...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

It depends on the inout level specification of the connected part. Many devices have a LVTTL specifiaction (about 1.6V Vih), they can be driven by 2.5V CMOS as well. Devices witha a 3.3V LVCMOS specification (Vih = 0.7*3.3V) in contrast typically work, but don't achieve a sufficient level margin, so a level translation IC should be used.