🚀 go-pugleaf

John Larkin <jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote in message 

> <jwilliams@itee.uq.edu.au> wrote:
> 
> >I'm looking for a 2.5V, 100MHz clock source, preferably in a surface 
> >mount package.  Any part or supplier suggestions?
> >
> >2.5V operation is my highest priority.  Existence of an Australian 
> >supplier would also be helpful!

> Um, how accurate? 

Well I'm not measuring the speed of light - but +/- 100ppm or so would
be good.
For any future critical time keeping applications I could use an RTC
chip or whatever.
 
> Must it be a crystal oscillator?

Not necessarily - just simple and stable - basically just solder it in
and off I go...

> Why 2.5 volts? Clocking an FPGA or something?

Precisely - and the IO bank onto which this clock comes is driving
some 2.5V DDR, so I don't have a lot of room to manoeuvre.

The FPGA is actually hosting a soft core microprocessor (running our
linux port no less!), so I'm just generating a processor clock with
it.  The FPGA has a digital clock synthesiser inside it that I could
use, but I'd prefer not to "waste" one if I don't need to (since the
DDR drive logic needs a couple as well).

But I should ask...  what are my options for simple and stable 2.5V
oscillators and lower frequencies (24Mhz, 66Mhz, ...)??

Thanks,

John