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Altera_Forum
Honored Contributor
Honored ContributorCyclone III I/O standard
Hi there, in the device family datasheet I read that the Cyclone III device supports LVTTL & LVCMOS. In order to interface the device with standard TTL circuits I think I need some kind of buffer...
Altera_ForumHonored Contributor
Honored ContributorUsually, devices from the LVC family.
Generic buffers work well for 5V TTL, for 5V CMOS you really have to go with the level shifters, such as the 74LVC4245A (8 bit): http://www.nxp.com/documents/data_sheet/74lvc4245a.pdf
