[SI-LIST] Re: Fan-out in TTL and CMOS--> There are some interesting high speed parts available in ECL
- From: "Salkow, Steven" <steven.salkow@xxxxxxxx>
- To: tom@xxxxxxxxxxxxx, leeritchey@xxxxxxxxxxxxx, kfrobinson@xxxxxxxxxx, venubabu@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Fri, 04 Feb 2005 17:06:06 -0800
There are some interesting high speed parts available in ECL from a
number of vendors
See http://www.inphi-corp.com/ for a look at GIGABIT logic
" Inphi's family of prescalers extends the applicability of these
devices up to 25 GHz, which represents a major breakthrough in microwave
circuit technology and paves the way for innovative and cost-effective
commercial, military, and aerospace applications."
Steve Salkow
Lockheed Martin
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Tom Dagostino
Sent: Friday, February 04, 2005 4:28 PM
To: leeritchey@xxxxxxxxxxxxx; kfrobinson@xxxxxxxxxx; venubabu@xxxxxxxxx;
si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Fan-out in TTL and CMOS
Lee
A lot of the models I've done recently have had a port or two of ECL
(PECL). They tend to be used in communications applications, military or
clock distribution. ECL may have high DC power consumption but as you
go up in frequency the power consumption of a CMOS gate can also be
relatively high.
Tom Dagostino
Teraspeed Labs
13610 SW Harness Lane
Beaverton, OR 97008
503-430-1065
http://www.teraspeed.com
tom@xxxxxxxxxxxxx
Teraspeed Consulting Group LLC
121 North River Drive
Narragansett, RI 02882
401-284-1827
Teraspeed is the registered service mark of
Teraspeed Consulting Group LLC
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Lee Ritchey
Sent: Friday, February 04, 2005 4:20 PM
To: kfrobinson@xxxxxxxxxx; venubabu@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Fan-out in TTL and CMOS
Ken,
Guess I overshot! There are still a few places that ECL is used and one
of them is what you mentioned. Still, as a logic family for other
applications, it's been pretty well displaced by CMOS. For most of us
designing high speed computers and such it may as well be dead. IF for
no other reason than power consumption.
Lee W. Ritchey
Speeding Edge
P. O. Box 2194
Glen Ellen, CA 95442
Phone- 707-568-3983
FAX- 707-568-3504
I just used the energy it took to be angry to write some blues. Count
Basie
> [Original Message]
> From: <kfrobinson@xxxxxxxxxx>
> To: <leeritchey@xxxxxxxxxxxxx>; <venubabu@xxxxxxxxx>;
<si-list@xxxxxxxxxxxxx>
> Date: 2/4/2005 3:24:24 PM
> Subject: [SI-LIST] Re: Fan-out in TTL and CMOS
>
> Lee,
> I certainly hope you don't take yourself too seriously. ECL is dead?
> I guess all the people around the world whom design ATE equipment
> should just find another line of work. Maybe write books?
>
> Ken Robinson
> Micron Technology=20
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx
> [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Lee Ritchey
> Sent: Friday, February 04, 2005 10:10 AM
> To: Ummalaneni, Venu Babu (Venu); si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Fan-out in TTL and CMOS
>
> Venu,
>
> Fanout is a DC loading concept for TTL. It has no meaning when
> talking about high speed circuits. Driver output impedance and rise
> time are what are important for COMS. CMOS inputs are purely
> capacitive, so they represent no DC load. TTL is dead as a
> technology, so worrying about fanout is behind us. By the way, ECL is
> dead as well.
>
> Lee W. Ritchey
> Speeding Edge
> P. O. Box 2194
> Glen Ellen, CA 95442
> Phone- 707-568-3983
> FAX- 707-568-3504
>
> I just used the energy it took to be angry to write some blues. Count
> Basie
>
>
> > [Original Message]
> > From: Ummalaneni, Venu Babu (Venu) <venubabu@xxxxxxxxx>
> > To: <si-list@xxxxxxxxxxxxx>
> > Date: 2/3/2005 10:11:18 PM
> > Subject: [SI-LIST] Fan-out in TTL and CMOS
> >
> > Hi Experts,
> >
> > I know that fan-out in TTL circuits is decided by noise margin,
> > i.e.;=20 if we want more fan-out noise margin has to diminishes.
> >
> > In case of CMOS which factor decides the fan-out. As there is no=20
> > static current drawn by the load, I hope time delay will decide
> > the=20 fan-out in case of CMOS.
> >
> > Please clear me if I am wrong. Any inputs are welcome.
> >
> >
> > Thanks in advance
> >
> > Best Regards,
> > Venu.
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