More on Crosspoints.

[Paul Maddox]

Rene,

>
> Ok, so my addition to the problem would be: Using several crosspoint
switch
> ICs in parallel. Say for a fully connectible n*n matrix that would be n
> chips. (If you only need less than n simultaneous connections per row you
> get away with less.) In essence its the idea with the multiplexers, but
the
> chip count is reduced. (Didn't check the price however.)
>

The cost of a maxim 8by8 chip is 6.07UKP, the 335 costs 2.72Ukp
Id need 8 of eaach still, so it would be more expensive..
Also it would take up more baord space (the 8 by 8 switchs are 40pin, 335 is
24pin)

> Now the thing would look like several crosspoints with their inputs in
> parallel, and the respective n-th outputs of all chips summed via
resistors
> (i.e. SIL array) into n opamps. Where the n-th summer would sum over the
> n-th outputs of the chips. So this would look somehow like a cube, with
> rows, columns and layers. There would be an added bonus that one could set
> more than one connection from one input to one output (on different
layers)
> so that one could use this for some scaling purposes.
>

Agreed, like a cube, but you still couldnt set more than one switch at any
layer
incase you had another switch set on that layer.

I see what you're saying but there is nor realy advantage, unless I missed
soemthing, in
useing 8 8by8 chips to using 8 8by1 chips.

Paul
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