MaxII with 5V TTL Compatibility

[Altera_Forum]

Hi all, 

 I am planning to migrate my CPLD design from Lattice series to Altera MAXII series. The only problem I am having at the moment in selecting device is 5V I/O TTL Compatibility. Lattice device are very much 5V TTL Compatible but Altera MAXII did not mention it clearly. The data-sheet tell that EPM1270 and EPM2210 at 3.3V can support 5V TTL I/O. I just wanted bit more details in this if possible.  Regards, Hitesh

[Altera_Forum]

I think, the datasheet is clear in this regard. MAX II isn't 5V tolerant, you have to use voltage clamps or similar means to use it with 5V logic level. See Table 2.7, MAX II MultiVolt I/O Support. Devices that compare with Lattice CPLD are e.g. Altera MAX3000.

[Altera_Forum]

Dear FvM, 

 Thanks for the reply. I agree with you up to certain extent but if I see the data sheet it will tell me some different stories. if you open the below link and see the page number 2-32 in chapter 2, it clearly mention there that EPM1270 and EPM2210 devices support 5V TTL Logic. altera.com/literature/hb/max2/max2_mii5v1_01.pdf   Will wait for your prompt feedback.  cheers Hitesh