RE: [SI-LIST] : Schottky diode termination

John Philips (John.Philips@whitecross.com)
Tue, 27 Oct 1998 14:03:41 -0000

Thanks for the replies

My original question stems from the fact i've just read the EDN article
"Termination Techniques for High Speed Buses" - published February 16, 1998.
This is the first time I've really thought about using diodes to terminate
signals, normally I think about this type of configuration as i/p protection
scheme. I have also read some apps notes from California Micro Devices.
There seems to be some differing opinions on their suitability as
terminating devices, so here is a brief view of the kind of work I'm doing.

In the circuits I design we are currently running at 66MHz with devices with
rise/fall times in the 1-2nS region. I'm just about to start work on a
design running at 100MHz with devices with slightly faster edge rates (.75 -
1.5ns). Most signals will be busses, with 2-4 loads, some are point to
point. Some of the busses will be heavily loaded as they drive SDRAM which
is configurable between either 18 or 36 loads.

john

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