Document Number: 70071

S-71241–Rev. H, 25-Jun-07

www.vishay.com

13

Vishay Siliconix

DG884

APPLICATIONS

These devices feature an address readback facility whereby

the last address written to the device may be read by the

system. This allows improved status monitoring and hand

shaking without additional external components.

address pins can sink or source current for logic low and

input logic threshold shifting.

Note: Even though these devices are designed to be latchup

operation or during power supply on/off sequencing.

Layout

The PLCC package pinout is optimized so that large

crosspoint arrays can be easily implemented with a minimum

number of PCB layers (see Figure 16). Crosstalk is

minimized and off-isolation is optimized by having ground

pins located adjacent to each input and output signal pins.

Optimum off-isolation and low crosstalk performance can

only be achieved by the proper use of RF layout techniques:

avoid sockets, use ground planes, avoid ground loops,

bypass the power supplies with high frequency type

capacitors (low ESR, low ESL), use striplines to maintain

transmission line impedance matching.

Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon

Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and

Figure 16. 16 X 8 Expandable Crosspoint Matrix Using DG884

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In Bus

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In Bus

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In Bus

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In Bus

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Out Bus

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Out Bus

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Out Bus

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Out Bus