[SI-LIST] Re: 50ohm SSTL2 Tx

  • From: Vinu Arumugham <vinu@xxxxxxxxx>
  • To: rajat@xxxxxxxxxxxx
  • Date: Thu, 16 Oct 2003 09:38:48 -0700

It should be labelled Class I. The SSTL2 spec. does not specify an upper 
limit on drive capability. So, even a Class II driver is Class I compliant.

Thanks,
Vinu

Rajat Chauhan wrote:

> Hi all, 
>  I am asked to design SSTL2 Tx to drive 50ohm line (unterminated). What
>i did is, sized my buffer to give first step equal to VDDS/2 at near end
>with 50ohm line connected. Without giving any look to SSTL2 JEDEC specs.
>It can drive SSTL2 Rx.
>   The confusion is, is this realy a SSTL2 Tx?
>   If Yes, how do i label it as class-I or class-II, because it comes
>out to be some where in between the two? For class-II it is weak and for
>class-I it is too strong.
>   If No, than that means we cannot have good SSTL2 Tx to drive 50ohm
>line (unterminated)?
>
>I am stucked....please help, i am missing something.
>Thanking in advance,
>Regards
>Rajat
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