A little overkill, but maybe this guy...
http://www.ti.com/lit/ds/symlink/cdc208.pdf
I think you could coerce some of the IDT fanouts to work as well.
Project: HDMI/DVI out for STFM
Re: Project: HDMI/DVI out for STFM
https://www.idt.com/document/dst/qs32x2245-datasheet
Datasheet a little unclear, but it lists "pass voltage" as 4V for 5V VCC.
Where did you read 2.4v ? That doesn't sound right.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Project: HDMI/DVI out for STFM
You've got a different datasheet there, I was talking about the NB3N551 - but I just checked again and VOH is given twice, once at 35mA where it's min. 2.4v and then again a bit further down where it's min VDD - 0.4v at 12mA, so that's a bit more like it.exxos wrote: ↑Mon Sep 03, 2018 8:12 am https://www.idt.com/document/dst/qs32x2245-datasheet
Datasheet a little unclear, but it lists "pass voltage" as 4V for 5V VCC.
Where did you read 2.4v ? That doesn't sound right.
I like the smallness of that one. A downside of the otherwise excellent CDC208 mentioned by Poobah is that it's really big compared to the 2x3mm chip I've got on there now.
Re: Project: HDMI/DVI out for STFM
I was thinking more about using it to buffer the 32MHz from the ST to the FPGA so that the frequency can be exact and work for the demo stuff.
I have put one of this on the new rev of our 68020 board (still not assembled one of the new one) but haven't tested it.
I think the actual Hi level is VDD – 0.4. I'm not sure what the 2.4V represents in the datasheet.
I have put one of this on the new rev of our 68020 board (still not assembled one of the new one) but haven't tested it.
I think the actual Hi level is VDD – 0.4. I'm not sure what the 2.4V represents in the datasheet.
Working ones : MegaSTE (68020) / TT030 / Falcon with AB040 & Eclipse / 1040STF
Need testing : Falcon with CT2
Need testing : Falcon with CT2
Re: Project: HDMI/DVI out for STFM
It's probably just being pulled down by the high current, 35mA must be near the maximum it's intended to supply.rpineau wrote: ↑Mon Sep 03, 2018 8:30 am I was thinking more about using it to buffer the 32MHz from the ST to the FPGA so that the frequency can be exact and work for the demo stuff.
I have put one of this on the new rev of our 68020 board (still not assembled one of the new one) but haven't tested it.
I think the actual Hi level is VDD – 0.4. I'm not sure what the 2.4V represents in the datasheet.
Unfortunately the FPGA on my shifter board is running at 3.3v, so this particular device wouldn't be able to act as a level converter in that direction (max input voltage is 3.8v when running on 3.3v supply). Maybe a resistor divider would work to reduce the voltage?
Re: Project: HDMI/DVI out for STFM
...or maybe the 32MHz clock could just be running at 3.3v in the first place, by transplanting the crystal?
Re: Project: HDMI/DVI out for STFM
Yeah but I thought the whole point was to use a proper clock driver
Re: Project: HDMI/DVI out for STFM
Now I found some 32.084988MHz oscs.. the bottom pcb has loads of room ?, so if enough room for a "DIP 14" osc then just bung one of those in your board.. then its the best frequency to use on all machines... but of course these are 5V... I suppose its either run it via the buffer, or they *might* run on 3.3V.. would have to check when they arrive...
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Re: Project: HDMI/DVI out for STFM
Worth a try. If the osc packages aren't too big then I can always put one in the cut-out area, since it's optional.