Dr. Anton T. Squeegee ) writes:
In article COwwc.24725$jl6.6833@edtnps89, says...

I'm building a SWRX with PLL frequency generator and need a 1/2 dozen of
these chips. They are unobtanium from my Vancouver suppliers.

I need the speed of AS or S because the master osc. will be 60-90 MHz.

The 74HC390, a dual decade counter in one package, has a maximum
clock frequency of 66MHz, and is readily available (or at least a lot
more so than the AS or S package -- less power draw too).

But given that the '192 is programmable, and this is a synthesizer
application, I suspect he wants the '192 for the divide by N counter
chain, not a fixed divider.

Michael VE2BVW

Wow! I did not anticipare such a wonder ful response. Thank you very much
all.

I will take *all* of your advice actually - I will use the 74AC192 for the
divide-by-N counters and try my hand at PLD's for the PLL and peripheral
circuitry.

I run Linux and can program Perl blindfolded, so writing a programmer will
be no problem :-)

Again, many, many thanks!

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca

"Gregg" wrote in message
news:COwwc.24725$jl6.6833@edtnps89...
I'm building a SWRX with PLL frequency generator and need a 1/2 dozen of
these chips. They are unobtanium from my Vancouver suppliers.

I need the speed of AS or S because the master osc. will be 60-90 MHz.

I'd use a CPLD - it'll be faster, cheaper and take up less board space. You
can use it for the rest of the logic as well, including the phase detector.

73, Leon
--
Leon Heller, G1HSM
http://www.geocities.com/leon_heller

In article COwwc.24725$jl6.6833@edtnps89, says...

I'm building a SWRX with PLL frequency generator and need a 1/2 dozen of
these chips. They are unobtanium from my Vancouver suppliers.

I need the speed of AS or S because the master osc. will be 60-90 MHz.

The 74HC390, a dual decade counter in one package, has a maximum
clock frequency of 66MHz, and is readily available (or at least a lot
more so than the AS or S package -- less power draw too).


--
Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
(Known to some as Bruce Lane, ARS KC7GR,
kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com
"If Salvador Dali had owned a computer, would it have been equipped
with surreal ports?"

Wow! I did not anticipare such a wonder ful response. Thank you very much
all.

I will take *all* of your advice actually - I will use the 74AC192 for the
divide-by-N counters and try my hand at PLD's for the PLL and peripheral
circuitry.

I run Linux and can program Perl blindfolded, so writing a programmer will
be no problem :-)

Again, many, many thanks!

--
Gregg
*It's probably useful, even if it can't be SPICE'd*
http://geek.scorpiorising.ca