RE: [SI-LIST] : Parallel Termination in Theory and Practice

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From: Hans Mellberg (
Date: Mon Aug 07 2000 - 08:01:28 PDT

What may work is a switchable terminator at the cost of an extra pin.

--- abe riazi <> wrote:
> Dear Chuck and Scott:
> Thank you very much for your interesting replies.
> Another important point related to topic of termination is appraisal of internal
> vs. external termination. The internal termination appears to offer advantages of
> eliminating the need for external stubs and components. But this is achieved at
> the price of sacrificing flexibility. For instance an IC having internal series
> termination eliminates the need for an external series resistor and the associated
> stub. But the disadvantage is that series termination is suitable only for
> certain routing topologies (such as point to point routing) and not the right for
> choice for other types of topologies (such as daisy-chain ). Similar reasoning
> applies to internal parallel termination. Variations in the characteristic
> impedance of the trace can be also better dealt with by use of external
> terminators.
> What are your thoughts on this subject ?
> Thanks again.
> Abe

Best Regards
Hans Mellberg

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