RE: [SI-LIST] : 5V PECL vs 3.3V PECL - VTT???

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From: Steeve Gaudreault (sgaud@nortelnetworks.com)
Date: Wed May 31 2000 - 04:16:43 PDT


Thanks to all,

I got my answer, VTT=Vcc-2V in both cases.

I have really appreciated your help.

Steeve

        -----Original Message-----
        From: Gaudreault, Steeve [SKPK:KC41:EXCH]
        Sent: Friday, May 26, 2000 7:26 AM
        To: 'si-list@silab.eng.sun.com'
        Subject: [SI-LIST] : 5V PECL vs 3.3V PECL - VTT???

        Hi all,

        Something confused me lately and I don't find any information that
explains this....I need some help.

        For a 5V PECL driver, its VTT is set at 3V (Vcc - 2V is the rule).
Does the same rule applies for 3.3V PECL Drivers ie VTT = (3.3V - 2V) = 1.3V
????

        I tend to set VTT around the middle point between VOH and VOL, but
for 3.3V PECL VTT its quite different when I do the math.

        any help would be appreciated.

        thanks,

        Steeve Gaudreault
        Nortel Networks

        

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