exxos's Atari, Amiga & retro forum

Smonson wrote: ↑Sat Sep 01, 2018 8:52 am I can't guarantee that the buffer will be fast enough for the 32MHz clock though, I recommend checking it on a scope before depending on it.

OK, what chip did you use ?

exxos wrote: ↑Sat Sep 01, 2018 10:34 am OK, what chip did you use ?

74LVC245A
https://assets.nexperia.com/documents/d ... CH245A.pdf

Smonson wrote: ↑Sat Sep 01, 2018 10:52 am

exxos wrote: ↑Sat Sep 01, 2018 10:34 am OK, what chip did you use ?

74LVC245A
https://assets.nexperia.com/documents/d ... CH245A.pdf

Have you guys looked at the IDT QuickSwitch devices?

poobah wrote: ↑Sun Sep 02, 2018 3:41 pm Have you guys looked at the IDT QuickSwitch devices?

I'm using them

Smonson wrote: ↑Sat Sep 01, 2018 10:52 am

exxos wrote: ↑Sat Sep 01, 2018 10:34 am OK, what chip did you use ?

74LVC245A
https://assets.nexperia.com/documents/d ... CH245A.pdf

Seems plenty fast according to that spec sheet, unless I'm misunderstanding something.

troed wrote: ↑Sun Sep 02, 2018 4:37 pm Seems plenty fast according to that spec sheet, unless I'm misunderstanding something.

I think it was just a suggestion..Nothing wrong with those of course.

For my stuff, I am pushing every MHz out of everything, so the IDT switches have pretty much zero delay, which is what I need. In case of the FPGA stuff, a few ns isn't going to make any odds. Though I guess the IDT stuff may be easier to solder as they (IIRC) are larger packages.

exxos wrote: ↑Sun Sep 02, 2018 4:57 pm ... Though I guess the IDT stuff may be easier to solder as they (IIRC) are larger packages.

Yup, I solder them by hand fairly easily.

The only reason I mention the buffer is that the one I used for the 16MHz line (M74VHC1GT125DF2G) can't hack it at 32MHz. Since 16MHz is not too fast by today's standards I didn't worry about it when selecting buffers.

May I suggest the NB3N551 for clock buffering :

https://www.mouser.com/datasheet/2/308/ ... -83648.pdf

Suggestions are welcome. But from the datasheet it looks like this device is only guaranteeing to produce a 2.4v high. Dunno if the Atari would be too happy with that.

But this is definitely the kind of thing I should have used in the first place