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

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