[SI-LIST] Re: PECL Tree structure
- From: "Ingraham, Andrew" <Andrew.Ingraham@xxxxxxxxxx>
- To: "Si-List@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 26 Dec 2001 07:58:26 -0500
ECL (and I assume therefore PECL) actually does work to drive a clock to
two devices, if you use a parallel termination at the second device
(i.e., daisy-chain from the driver to first receiver, then second
receiver, then termination).
It may also work to route from the source to each receiver, with
terminations at each receiver. You need to make sure the driver chip
can support the combined load. The output current would be double, and
the voltage amplitude slightly reduced. Some driver chips are designed
to handle such a double load.
If clock skew between your two receivers is a consideration, you might
want to co-locate the two receivers, but then you have the problem that
the package parasitics are doubled (especially Cin), and this may
adversely affect the waveshape on fast edges. With such fast edges, you
should always simulate it anyway.
Andy
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