FreeLists / si-list / [SI-LIST] Re: Vih for PCI

["Ingraham, Andrew" <Andrew.Ingraham@xxxxxx>]

> Some people are saying that PCI Vih =3D 0.9*Vcc but im my opinion this
> =
> is the driver output DC specification.
> 
> I've found out following values from the PCI specification and I
> believe =
> these are the correct ones.
> 
> +5V I/O mode PCI -> Vih min. =3D +2.0V
> +3.3V I/O mode PCI -> Vih min. =3D 0.5 * Vcc
> 
> Which information source should I believe?
 

You could go to the PCI Specification (if you or your company has a
copy), or one of the books about PCI.  Better than relying on rumors or
something said over the internet.

But you are correct.

Vih(min) = +2.0V for 5V signaling
Vih(min) = 0.5*Vcc for 3.3V signaling

Voh(min) = +2.4V @ Iout = -2mA for 5V signaling
Voh(min) = 0.9*Vcc @ Iout = -500uA for 3.3V signaling

Regards,
Andy



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