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RE: PCI bus 3.3V to 5V addapter card
- To: Mailing List Recipients <email@example.com>
- Subject: RE: PCI bus 3.3V to 5V addapter card
- From: Andrew Ingraham <Andrew.Ingraham@digital.com>
- Date: Tue, 16 Feb 1999 10:25:55 -0500
- Cc: "'pci-sig'" <firstname.lastname@example.org>
- Delivered-To: pcisig@teleport.COM
- Resent-Date: Tue, 16 Feb 1999 08:04:43 -0800
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Franklin Koppen asked:
>I have a Silicon Graphics 320 Visual Workstation with a PCI bus that
>supports only 3.3 V
>Do you know if there are DC/DC convertor PCI-cards in the market that
>will take the 3.3 V from the PCI bus,transform it to 5V, put the 5V on
>5V pins of the PCI bus?
Even the SGI workstation surely has 5V *power* on the appropriate 5V
power pins. It is mandatory.
I think what you are looking for is something to change the signal
switching levels. That is more complicated, it can't be done with a
simple voltage converter. It generally takes a PCI-PCI bridge, extra
mechanical considerations, etc. Some parts don't work with PCI-PCI
Are you aware that many PCI adapter cards on the market are "Universal"
and can be plugged into PCI connectors that use either 3.3V or 5V
>Are the PCI-bus connectors "keyed" for 3.3V and 5V cards or is this not
>controlled in the PCI-specs?
Yes, they are keyed, according to the specs. "Universal" PCI cards have
both key cutouts so they can be plugged into either connector.