Re: [SI-LIST] : High speed board to board connection

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From: Andrew W. Riley III (drewmeister3@earthlink.net)
Date: Sat May 26 2001 - 08:24:41 PDT


Hello,

I recently changed employers to move into PCB design, but the company I used to work for uses the MICTOR connector on their current design.

You will have to pay attention to seating and extraction. The MICTOR must be pushed straight in and pulled straight out with a small tolerance for error. Moving the motherboard can cause the connectors to separate just enough to create problems with design verification. I even observed the senior engineer having problems without moving the motherboard. This was solved on the second proto-run by adding mounting holes near the MICTOR on the motherboard and daughter card to always ensure proper seating. Due to the density of the design, small notches near the MICTOR on the front end daughter cards made extraction relatively painless.
If you have any programmable logic, a problem that you can run into is at prototyping if it is decided signals must be moved or added for whatever reason - the pin pitch makes adding jumper wires to the prototype no trivial task. Real estate and design issues did not allow for test-points on the 114-pin connector they use.
The design also used two 8-pin @ .100" for power.

Accounting for the above and no real SI lab to see any effects the connector has on critical nets, I believe the MICTOR is a good choice.

Good luck!

Cheers,
Drew

----- Original Message -----
From: "Shahar Eytan" <shahar@mellanox.co.il>
To: <si-list@silab.eng.sun.com>
Cc: "Shahar Eytan" <shahar@mellanox.co.il>
Sent: Saturday, May 26, 2001 2:00 AM
Subject: [SI-LIST] : High speed board to board connection

> Hi All,
>
> I'm looking for a solution for connecting a motherboard to a daughter card.
> The signals between the boards are 2.5Gb/s differential (total of 8 pairs,
> and maybe few low speed control lines).
> In addition, I'll need to have a power connector for each of the daughter
> cards (I thought to separate the two connectors for mechanical strength).
>
> Do you have any suggestions regarding pairs of connectors (signal and power)
> that can fit into my design. Of course they should be as short as possible
> in order to fit in the chassis, and with the same height so the daughter
> card will be parallel to teh main board.
>
> I thought of Mictor connector for the signals, what do you think of this
> connector for board to board connection? Any idea of a power connector with
> the same height?
>
> Thanks,
>
> Shahar Eytan
> Mellanox Technologies Ltd.
>
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