[Coco] 6309

[Dave Philipsen]

> No, I doubt they would be 5v tolerant when running at 3.3v.  My application for it in that mode would not be in a CoCo either.
> 
> Dave
> 
>>> On Jul 11, 2017, at 12:14 PM, RETRO Innovations <go4retro at go4retro.com> wrote:
>>> 
>>> On 7/11/2017 11:46 AM, Dave Philipsen wrote:
>>> I'm not 100% sure on this and I intend to find out but I think the 6309 will run reliably at 3.3v thus drawing even less power. Don't know how it would hold up at different (higher) clock speeds at that voltage either.
>> But, if it runs at 3V3, are the IO IO pins 5V tolerant :-)
>> 
>> Of course, you can run the entire thing at 5V, or surround the '09 with buffers, but pay attention.  I have no evidence suggesting they are not, but some "hi driver" configs might allow backfeed of the 5V IO voltage to the core, overloading some circuit paths not designed to handle the additional power.
>> 
>> Jim