Peter,
I've done extensive prior searches on Google. Google is my standard search
engine, it's in my favorites and is number 1 on my links bar; I'm not
someone who asks on this list before doing my own research if that was your
concern?
The Frequency counter you pointed to uses a prescaler which works OK but
means you lose the lowest 8 bits of binary resolution = 2560 kHz steps in
counting on /256 at a gate time of 0.1 secs.
Spehro and Martin's suggestions to search for 'ECL' yeilded (on Google) the
On-Semi device MC10E016 that counts at 700 MHz min and 900 Typical : ) This
also has Q outputs that can be read after the count has happened.
Thanks to all for your input.
Ted Mawson
----- Original Message -----
From: "Peter Onion"
To:
Sent: Monday, February 18, 2002 12:41 PM
Subject: Re: [PIC]: logic gate speeds
> On 18-Feb-02 Ted Mawson wrote:
> > The maximum clock speed I understand that a PIC can count at is 50 MHz -
> > correct?
> >
> > I want to count at higher frequencies - up to 500 MHz and I'm looking to
use
> > a logic counter to divide 500 by 16 and give an input frequency into the
PIC
> > of 500/16 = 31.25 MHz.
> >
> > There's a 7400 series chip, the 74F161 that divides by 16 but the max
i/p
> > frequency is 100 MHz. Are there any 7400 series other than F that can
go
> > faster or any equivalents that y'all know of?
> >
> > Can anyone point me to a counter, ideally pre-settable and with
accessible
> > (to read) outputs, that could take a clock input for counting faster
than 100
> > MHz and divide by 16?
>
>
> Google search for "VHF Prescaler" found me at
> http://www.qsl.net/om3cph/vhf_uhf.html
>
> which has a 1.3Ghz freq counter based on 16F84
>
> Maybe you could try google next time for yourself ?
>
> Peter
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways. See http://www.piclist.com/#archives for details.
>
>
--
http://www.piclist.com hint: The PICList is archived three different
ways. See http://www.piclist.com/#archives for details.