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Altera_Forum
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14 years ago

5V i/O

Hello, I need to have TTL (+5V for HIGH) inputs and outputs from an Altera DE0 board. Is there any easy way to configure it for I/O pins to operate at 5V? Due to time constraint, I am try...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

Hi,

on DE0_v.1.1_CDROM\DE0_CD-ROM_v.1.1\Schematic\DE0_V12_RELEASE.pdf page 17, all the VCCIO are connected to VCC3p3.

The VCC3p3 comes from the REG3 on page 18 specific for 3.3V only, plus the VCCIO has a maximum rating of 3.9V (cycloneIII device datasheet P1) plus VIH max is VCCIO+0.3V.

So I guess that you do need voltage translation.

Regards.