> I think the original spec was reasonably clear
> Viz
> 
> >I need a low frequency vco that draws very little power. ...
> > I need something that will oscillate between 55 and 65 Khz. It has 
> > to draw microamps of supply current, and I prefer the control
> > voltage range to be between 1 and 3 volts.
> 
> The implication (to me anyway) is that he wants an oscillator which is 
> tuneable in a reasonably smooth manner between 55 & 65 KHz by a
> 1 to 3 volt signal

That might not necessarily have been the requirement. There was
no mention of infinite (ie analogue) variability or even whether there
were any steps between 55kHz and 65kHz, or over what time
period. I didn't mean to sound snippy in my reply but you know
how often we play 20 Questions

Apart from the PIC and 40xx there may not be alternatives at
that power level

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