[coco] 6309 speed

[jdaggett at gate.net]

That tells me there is some issues with the output circuits that have 
transients during switching especially at higher speeds and low load 
capacitances. The glitches are most likely ringing or other transient 
responses as the CMOS push pull stack switches or the drivers to 
the Class B output stage switches. 

50 Ohms and a load capacitances of 12 to 30 pF will form a nice L 
network low pass filter. 

james


On 3 Aug 2005 at 20:43, Paul T. Barton wrote:

Date sent:      	Wed, 3 Aug 2005 20:43:15 -0700 (PDT)
From:           	"Paul T. Barton" <idezilla at yahoo.com>
Subject:        	Re: [coco] 6309 speed
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> In the manual for Hitachi 6309/E chips,
> it states that you must put in 50-100 ohm
> resistors in the data path and address lines
> because they glitch. address lines take
> 50 or 100 and date lines the other,
> can't remember which.
> 
> Paul - idezilla
> 
> --- Gene Heskett <gene.heskett at verizon.net>
> wrote:
> 
> > On Wednesday 03 August 2005 10:34,
> > jdaggett at gate.net wrote:
> > >Roy
> > >
> > >The CMOS process that the 6309 was most likely
> > done on is prior to
> > >high speed or HCMOS days. Outside a
> > potentential die shrink
> > >during production, I doubt much other changed.
> > >
> > >Most likely done on 9V or 11V CMOS and at 5
> > VDC, I doubt the
> > >speed can exceed much beyond 5 MHZ or so. Then
> > that will need
> > >proper heat sinking. The main problem in heat
> > is the actual plastic
> > >dip package itself. Plastic is not a great
> > conductor of heat.
> > >
> > >james
> > 
> > I don't recall ever seeing a regular cmos
> > transition in less than 25 
> > or 30 ns, and that took 28 volts on a 15 volt
> > rated chip to do that.  
> > I was using it as an edge generator in a tv
> > character generator.  It 
> > ran about 20 degrees above ambient, and did it
> > 24/7 for several years.
> > 
> > The 63C09's that I have can muster up edges on
> > most pins as fast as my 
> > scope can see, 10 ns as its only a 100mhz dual
> > trace.  That sort of 
> > speed isn't old time plain cmos by quite a long
> > row of apple trees.
> --snipped--
> 
> 
> 
> 
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