Re: [SI-LIST] : [Fwd: Majordomo results: Looking for high speed buffer parts]

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From: sweir (weirsp@a.crl.com)
Date: Thu Nov 04 1999 - 16:30:59 PST


Jason,

 From your post, I guess that you want 3.3V SSTTL levels. 240MHz is really
beyond any practical upper limit for SSTTL. There isn't much out there that
can reliably get below a Tpd of 1.5nS, which would typically be suitable to
150-166MHz at the high-end. If you want to reach beyond 200MHz, it is time
to use low-swing logic.

The application sounds like a phase-splitter. If it is, instead of an
inverter try a precision delay line, either buried in etch, or off the shelf.

The 120MHz mux / FF can be implemented in either a 5nS or 3nS GAL. Which
grade is appropriate depends on the specifics of your Tsu and Th
requirements.

Regards,

Steve.
At 05:24 PM 11/4/99 -0800, you wrote:

> I am looking for two high speed TTL/CMOS parts, and
>wonder if some of you could give me a pointer.
>
> 1) a high speed inverting buffer (TTL or CMOS) that can
> handle 240 Mhz signal and drive 100 Ohm or 50 Ohm transmission
> line.
>
> 2) A 2-input mux followed by a flip flop (TTL or CMOS) that
> can handle 120 Mhz signal and drive 100 or 50 Ohm.
> If a combo part is not available, two separate parts might be ok.
>
> Thanks in advance for your help!
>
>-Jason Zheng
>
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