[time-nuts] low power divide by 5

[Dan Kemppainen]

Just a thought:

https://www.analog.com/media/en/technical-documentation/data-sheets/hmc438.pdf

Although it isn't really 'low power', and the input and output ranges 
are somewhat limited. Certainly not logic level.

Dan




On 7/1/2020 2:50 AM, time-nuts-request at lists.febo.com wrote:
> Message: 4
> Date: Wed, 1 Jul 2020 00:47:32 +0200
> From: dschuecker<Detlef.Schuecker at dschuecker.de>
> To:time-nuts at lists.febo.com
> Subject: Re: [time-nuts] low power divide by 5
> Message-ID:<aa8f5e52-021e-0471-84b8-531653dace41 at dschuecker.de>
> Content-Type: text/plain; charset=utf-8; format=flowed
> 
> Hi,
> 
> a divide by five should possible with a synchronous state-machine made
> of 3 ( sufficiently fast-) JK-FlipFlops.
> 
> All 3 FFs are clocked with the input freq. , the outputs of the FFs are
> fed back to the the JK-inputs,? the divided freq. is output of one of
> the FFs.
> 
> Additional constraints: no external ANDs or ORs or NOTs, the
> state-machine does not get stuck in the 3 unused states.
> 
> This turned out to be a very interesting problem and I do not yet come
> up with a solution. Maybe there is none. Analytical solutions all
> failed, I will try a brute force enumeration attack tomorrow.
> 
> lots of fun !
> 
> Cheers