Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

My PCB design for Cyclone II ep2c20F484;ep2c35F484

I am begginer ir FPGA and the problem I have is with these development bords is that they are very expensive! cheapest bord I found with cyclone II ep2c20 FPGA is firefly bord with cost 350$ and its ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Can VCC INT be 1.8V insed of 1.2V ??

I ask becouse I found one DC-DC 2.5Mhz step down regulator SC2440 SEMTECH which I can buy in digikey (all ather Mhz range regulator as don't company person I can't buy in small Quantitys (4)) for 3.7$ and it has 2 separet outputs (eatch 2A) with separet voltage levels and problem is that there in datasheet is few example designs ( 1.8v 2A and 3.3V 2A output setings) and there is no 1.2V 2A design and i don't know these ather compnent values (there is calculation example but I don't want to get in to it so If it is posible to use 1.8V in VCC INT it would be mutch easyer without calculation.

I looked in Cyclone II device family data sheet and there was sayed that VCC INT must be 1.2V but in other table ( Table 5-1.Device absolute maximmum ratings, page 103) was that VCC INT max can be 1.8V)

So how it is can I suply 1.8V in VCC INT ???

I think that this SC2440 is cheapest DC-DC that could be found with 2 voltages and 2A load rating.