Electrical specs for PS/2 devices?

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Does anyone have detailed electrical specs for the PS/2 interface?
Google is not my friend; I'm finding billions of Playstation links,
and basic specs for COTS keyboards, but nothing detailed enough.

I want to interface a 3.3V micro (with 5V-tolerant inputs) to a PS/2
keyboard; can I simply operate the clk/data pins in "open collector"
mode with a pullup to +5V?

Or is this even necessary - what's Vih for the keyboard; will 3.3V
driven from the micro in totem-pole mode be high enough?

Thanks.

 

[Rich Grise]

Does anyone have detailed electrical specs for the PS/2 interface?

They're all over the place.

Google is not my friend;

Then why are you posting from it?

I'm finding billions of Playstation links,
and basic specs for COTS keyboards, but nothing detailed enough.

Try googling for "PS/2 keyboard interface spec".

Good Luck!
Rich

 

[Paul E. Schoen]

Don't reply to spam (as you did elsewhere), and if you do, don't quote the
crap.

Paul

 

[David L. Jones]

Does anyone have detailed electrical specs for the PS/2 interface?
Google is not my friend; I'm finding billions of Playstation links,
and basic specs for COTS keyboards, but nothing detailed enough.

You didn't try too hard.
Google almost anything to do with "PS/2 interface" and wikipedia is your
first link:
http://en.wikipedia.org/wiki/PS/2_connector
and that links to the excellent Beyond Logic site:
http://www.beyondlogic.org/keyboard/keybrd.htm

I want to interface a 3.3V micro (with 5V-tolerant inputs) to a PS/2
keyboard; can I simply operate the clk/data pins in "open collector"
mode with a pullup to +5V?

Yes, that's how it works.

Dave.