From: Ron Miller (rmiller@Brocade.COM)
Date: Fri Nov 05 1999 - 09:03:32 PST
I also am going to be using sstl in an ASIC. Since what I am reading
there is concern about high speed performance.
So, if we get in trouble I need to know of possible alternate sources.
Could you divulge who your ASIC supplier is?
Jason Zheng wrote:
> > Be careful if you intend to use an inverter as a clock buffer. The alvc
> > stuff is pretty fast, but not nearly fast enough for your needs. That
> > particular part is about 4nS spec into a heavy load, and a minimum Tpd spec
> > of 1nS. At 240MHz Tpd alone is 50% of your cycle interval. That
> > translates to linear amplifier. I don't know who did your ASIC's or the
> > system design, but 240MHz at SSTTL is going to be very hard to do.
> Thank you for your help!
> Our ASIC is committed already. We are designing the prototype
> board to bring it up. For now, it only needs to work at
> room temperature (instead of the worst case conditions). If
> the IDT74ALVC16244A part (or GAL16LV8) is not fast enough for
> room temperature application, do you know of any other part that
> might do? We will have adjustable delay lines to tune the skew
> among ASICs, so the skew is not the prob. But it needs
> to drive 100 or 50 ohm transmission lines for TTL/CMOS levels.
> Thanks again!
> > Regards,
> > Steve.
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