TPM wrote:
> Moreover, what is the cheapest way to produce a variable clock speed
> up to 166MHz (and possibly beyond, for other applications)?  A PLL?
> Any chip you may suggest me?

Larry Amontec wrote:
> Why not a CPLD or FPGA. And do your own frequency synthesizer using an
> accumulator. For high speed accumulator, use pipeline methodology.

Leonard Gabrielson wrote:
> Re the clock: If you're going to put a processor in the project that's
> I2C capable, use the AD9834 to divide down a nice high frequency
> oscillator to any frequency you want.

Both suggestions are DDS (Direct Digital Synthesis).  That's great for a
lot of things but not so great for producing high frequency square
waves.  For that, you're much better off with a PLL.  You might try the
Cypress CY22150 or CY22393/4/5 programmable clocks.  They're fairly
inexpensive, and available from Digikey.

	http://tinyurl.com/923g2
	http://tinyurl.com/dyden

For the CY22150, they have a nifty little "Licorice" demo board (CY30700),
that only costs $20.

Eric
	

nospam@nospam.com wrote:
> Hi!
> I have a big FIFO chip covered by dust, that I'd like to finally use.
> The most useful application I'm imagining for it is to finally make
> myself a logic analyzer. This FIFO (Texas Instruments SN74V3690-6PEU)
> is a 3.3V device, but has 5V tolerant inputs. "Great!" I thought.
>
> What I'm asking you is: should I connect the probes (just a header
> cable) directly to the FIFO, or should I use an high speed buffer
> inbetween? Consider that the chip is specced at 166MHz.
>
> Moreover, what is the cheapest way to produce a variable clock
> speed up to 166MHz (and possibly beyond, for other applications)?
> A PLL? Any chip you may suggest me?
> 
> Thanks!
> TPM

Re the clock:  If you're going to put a processor in the project that's
I2C capable, use the AD9834 to divide down a nice high frequency
oscillator to any frequency you want.  Analog Devices has a web tool to
help you get the hang of programming it, and it's a GREAT chip!

http://www.analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/ad98334/ad9834.html

Good luck!
Len

Re the clock:  If you're going to put a processor in the project that's
I2C capable, use the AD9834 to divide down a nice high frequency
oscillator to any frequency you want.  Analog Devices has a web tool to
help you get the hang of programming it, and it's a GREAT chip!

http://www.analog.com/Analog_Root/static/techSupport/designTools/interactiveTools/ad98334/ad9834.html

Good luck!
Len

nospam@nospam.com wrote:
> Hi!
> I have a big FIFO chip covered by dust, that I'd like to finally use.
> The most useful application I'm imagining for it is to finally make
> myself a logic analyzer. This FIFO (Texas Instruments SN74V3690-6PEU)
> is a 3.3V device, but has 5V tolerant inputs. "Great!" I thought.
> 
> What I'm asking you is: should I connect the probes (just a header
> cable) directly to the FIFO, or should I use an high speed buffer
> inbetween? Consider that the chip is specced at 166MHz.
> 
> Moreover, what is the cheapest way to produce a variable clock
> speed up to 166MHz (and possibly beyond, for other applications)?
> A PLL? Any chip you may suggest me?
> 
> Thanks!
> TPM
> 
Why not a CPLD or FPGA. And do your own frequency synthesizer using an 
accumulator. For high speed accumulator, use pipeline methodology.

Laurent
www.amontec.com

Hi!
I have a big FIFO chip covered by dust, that I'd like to finally use.
The most useful application I'm imagining for it is to finally make
myself a logic analyzer. This FIFO (Texas Instruments SN74V3690-6PEU)
is a 3.3V device, but has 5V tolerant inputs. "Great!" I thought.

What I'm asking you is: should I connect the probes (just a header
cable) directly to the FIFO, or should I use an high speed buffer
inbetween? Consider that the chip is specced at 166MHz.

Moreover, what is the cheapest way to produce a variable clock
speed up to 166MHz (and possibly beyond, for other applications)?
A PLL? Any chip you may suggest me?

Thanks!
TPM