Programmable Devices
CPLDs, FPGAs, SoC FPGAs, Configuration, and Transceivers
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Produce 5v output?

Altera_Forum
Honored Contributor II
‎02-24-2010 04:32 PM
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Hi all, 

 

I am using expansion header on my DE1 FPGA board to output my pwm signals. However, the output signals are 3.3v only. How do I set it to output 5v? I can't seem to find it in pin assignment as most of it shows 3.3v. Is it possible to output 5v or I must use some voltage level shifter? Thank you in advance.
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Altera_Forum
Honored Contributor II
‎02-24-2010 05:29 PM
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Except for a few legacy devices, Altera programmable logic is limited to 3.3V I/O voltage. The I/O cells also aren't 5V tolerant. To achieve 5V output, you need level shifters. The 3.3V LVCMOS I/O standrad can however drive 5V TTL with a sufficient high level. Many 5V supplied logic devices and peripherals can be reliably operated this way.

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