[time-nuts] PDIP package 100 MHz decade dividers

[Didier Juges]

A long time ago I used a 74AC74 to prescale a 100MHz VCO down to 25, the
74AC74 was AC coupled to the VCO and the signal was a fraction of a volt.
Worked quite well.
Probably not time-nuts quality but in a pinch it did the job at the time.
Didier

On Sat, Jul 11, 2020 at 9:37 PM Alex Pummer <alex at pcscons.com> wrote:

> Hi Perrier
> https://www.y-ic.es/datasheet/3b/74F569SC.pdf   will work
> 73
> KJ6UHN
> Alex
>
> On 7/11/2020 3:00 PM, Perry Sandeen via time-nuts wrote:
> > Learned List,
> > On previous posts I was looking for a PDIP package 100 MHz decade
> divider. Reading just the front of the data sheet I thought that the
> 74LS161 would work. Boy, was I wrong.  Several members posted that 25 Mhz
> max was its limit.
> > So *on the road again* (sorry Willie) I went on another search this time
> with the correct logic family.
> > It turns out Arrow carries the 74HC161 for less that $1.
> > Additionally I D/L'd the Charles Wenzel Unusual Frequency Dividers PDF
> and discovered a 100 MHz decade divider circuit using 1/2 of a 74HC74 in a
> configuration that will decade divide up to 300 MHz.
> > I'm attaching a copy of the circuit for anyone interested.
> > Regards,
> > Perrier
> >
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