[Coco] Hitachi HD63C09 Question

[jdaggett at gate.net]

MArk 

Going to interface to a Spartan 3 or 3E. The inputs and outputs are not 5 volt 
tolerant. I can add some interface ICs or resistors. Preferably what would be nice 
is to have the 6309 operate at 3.3 to 3.6 VDC. 

I know that the 6309 is CMOS and was first designed in the mid 80's about the 
dame time the H C11 series came on the scene. I do know that the HC11's will 
operate between 3.3 and  5VDC. The EPROM OTA's will not program at 3.3 VDC 
though they will operate at 3.3VDC. 

I guess I will try it and see what happens. Let you know.


james

On 22 Jun 2007 at 9:50, Mark Marlette wrote:

> james,
> 
> Depending on the specfics of what you are trying to do. It depends.
> 
> Most of the CPLDs/AVRs that we are now using at Cloud-9 are 3.3vdc.
> 
> Most are 5v tolerant I/O and depending on what family you are  
> interfacing to requires you do either to pullup and have OC/OD outputs
>  or nothing at all. Generally a white paper by the manufacture.
> 
> Not sure on the Hitachi, that is on the 5vdc side of our designs.
> 
> Good luck on your project.
> 
> Regards,
> 
> Mark
> Cloud-9
> 
> Quoting jdaggett at gate.net:
> 
> > On 20 Jun 2007 at 22:00, George's Coco Address wrote:
> >
> >> Since you've asked this before and no one has replied, I would
> >> assume that no one has tried it, or won't admit to it. It is an
> >> interesting query.
> >>
> > **************
> >
> > KInd of why I am asking is I am working on a project that has a lot 
> >  of 3.3V logic. If the processor would run at that voltage then it
> > would simplify   interfacing the processor to the rest of the
> > circuit. I was just wondering if anyone  
> >  had tried before
> > I did.
> >
> > james
> >> ----- Original Message -----
> >> From: <jdaggett at gate.net>
> >> To: "coCoList for Color Computer Enthusiasts"
> >> <coco at maltedmedia.com> Sent: Wednesday, June 20, 2007 8:41 PM
> >> Subject: [Coco] Hitachi HD63C09 Question
> >>
> >>
> >> >I know the Coco Community has used the Hitachi 6309 chip for a
> >> >while. Most
> >> > operation has centered around speeding up the 63C09E be yond
> >> > 3MHz. I was wondering if anyone has experimented running the MPU
> >> > at or below 2MHz and at 3.3VDC instead of 5VDC? IF the 63C09 was
> >> > designed in the mid 80's then it is possible that at normal
> >> > speeds the 63C09E just might run at 3.3VDC.
> >> >
> >> > Has anyone attempted or does anyone know of any tests done with
> >> > lower VDC?
> >> >
> >> > james
> >> >
> >> > --
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> >>
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