Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

TTL Compatible IO from a FPGA

Status
Not open for further replies.

davidgrm

Full Member level 4
Joined
Apr 8, 2006
Messages
233
Helped
31
Reputation
62
Reaction score
10
Trophy points
1,298
Activity points
2,727
interfacing cyclone iii devices with 5v ttl

Hi
I am starting a new design that requires a FPGA that can interface to 74hcxxx logic and also to microcontrollers such as the 80c51. I have being looking at using the Cyclone from Altera but see that it does not really support 5V IO. If you have used this or a similar device for 5v IO I would appreciate your comments

Thanks

David
 

benradu

Member level 3
Joined
Jun 22, 2001
Messages
67
Helped
8
Reputation
16
Reaction score
3
Trophy points
1,288
Activity points
372
Spartan 2/2E from Xilinx is 5V tolerant.
 

coolsniper

Junior Member level 3
Joined
Feb 9, 2002
Messages
29
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
123
now most the fpga work with lvttl (3.3V), but xilinx and altera both provide application notes describling how to design the 5V interface circuits.
 

davidgrm

Full Member level 4
Joined
Apr 8, 2006
Messages
233
Helped
31
Reputation
62
Reaction score
10
Trophy points
1,298
Activity points
2,727
I have not found anything on the Altera or Xilinx sites, and it appears that the older parts that handle 5V are no longer for sale by them
 

ilikebbs

Advanced Member level 4
Joined
Nov 30, 2002
Messages
105
Helped
3
Reputation
6
Reaction score
1
Trophy points
1,298
Activity points
718
why do not you use 3.3v peripheral device??
 

praveen10

Newbie level 5
Joined
Mar 30, 2006
Messages
10
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,353
hi,
u can use APEX family(FPGA) from @ltera that has 5V input tolerant.
Or if u like to have additional chip named level translator it can convert 3.3V to 5 V and vise versa.this would be useful to make ur application very easier.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top