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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

According to TTL specification, 3.3V level is sufficient, because TTL Vih,min is 2.0 V. If you want to drive 5V CMOS with Vih,min of 3.5V, a level translator can't be avoided.