RE: [SI-LIST] : HSTL Termination

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From: Dagostino, Tom (tom_dagostino@mentorg.com)
Date: Wed May 30 2001 - 10:06:15 PDT


The min values of Io tells the user that at Vol (Voh) the part will be able
to sink or source at least X amount of current. This tells you the maximum
output impedance at that voltage. This tells you that you can load the
driver to that current level and still meet the Voh/Vol spec for noise
immunity. I've seen very few drivers that specify the max current other
than under short circuit conditions. Most drivers will easily

Tom Dagostino
Modeling Manager
Mentor Graphics Corp.
SAE
tom_dagostino@mentor.com
503-685-1613

-----Original Message-----
From: Jinto N.Jose [mailto:jinto.jose@wipro.com]
Sent: Wednesday, May 30, 2001 6:25 AM
To: SI List
Subject: [SI-LIST] : HSTL Termination

Hello Everybody!
        One of the suggested termination for HSTL class-I is

                           ___ 0.75V
                            |
                            /
                            \ 50 ohms.
                      /
        |\ \ |\
        | \_____________|_| \
        | / | /
        |/ |/

        How is this usually realized ? Do any body use a +0.75 power supply
for
this ?
What about the topology shown bellow - is it a valid termination for HSTL- I
signals

                           ___ 1.5V
                            |
                            /
                            \ 100 ohms.
                      /
        |\ \ |\
        | \_____________|_| \
        | / | | /
        |/ / |/
                            \
                            / 100 ohms
                            \
                            |
                           ---
                           ///

        In all HSTL specifications I have seen , I have found Ioh and Iol
min
values and not the max values. What is the significance of this minimum
output current specification ?

Regards
Jinto

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