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CLC018 датащи(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали CLC018
подробное описание детали  8 x 8 Digital Crosspoint Switch, 1.4 Gbps
PDF  18 Pages
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

CLC018 датащи(HTML) 11 Page - National Semiconductor (TI)

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Operation (Continued)
EXPANDING THE NUMBER OF INPUT PORTS
Expanding the number of inputs in a switch array is accom-
plished by wire-ORing the outputs together, and TRI-
STATEing the outputs of the CLC018s that do not have their
inputs selected. The output bus should be a controlled im-
pedance transmission line with proper termination. This is
shown in
Figure 11. The circuit uses a 1-of-2 decoder with
complemented outputs to control the TRI pins of the
CLC018s in the array. Thus, all CLC018s are programmed
simultaneously, and all of them, except for the one with the
selected input, are placed in the TRI-STATE mode.
EXPANDING BOTH INPUTS AND OUTPUTS
To increase both the number of inputs and outputs in an ar-
ray, apply both the input port and output port expansion tech-
niques simultaneously. In
Figure 12, this is shown for the
case of a 24 input by 32 output switch array. Note that both
input and output busses need to be controlled impedance
transmission lines. The CS pins for rows of CLC018s are
connected together and become the row select inputs,
whereas the TRI pins are connected together for the col-
umns of CLC018s and become the column select pins.
DS100088-20
FIGURE 10.8x16 Crosspoint Example
www.national.com
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