Some PLL help if you please

[JVR]

Hi Gents, so leading on from this topic, I now need a PLL that will take a sub 100KHz input at a ~7% duty cycle, and give me an output north of 5Mhz with a 50% duty preferred.

I've looked at the old school 4046, but it can output a max of 1Mhz, I'm also looking at the SN74LS297, but I'm unsure what it will think of the low DC input signal. I cant seem to find any modern PLL chips that will take a <1Mhz input signal, and I'd much prefer not to have to cascade the chips.
So please, ye gods of high speed circuity, help a brother out.

Thanks!
JVR

[fcb]

Use a 74HC4046 - good for over 10MHz

[David Hess]

Or use the 4046 with an external VCO.