DG884

Vishay Siliconix

Document Number: 70071

S-52433—Rev. G, 20-Dec-04

www.vishay.com

11

DEVICE DESCRIPTION

Readback

The I/O facility enables the user to write data to the Next Event

latches or to read the contents of the Current Event latches.

This feature permits the central controller to periodically

monitor the state of the matrix. If a power loss to the controller

occurs, the readback feature helps the matrix to recover

rapidly. It also offers a means to perform PC board diagnostics

both in production and in system operation.

/

Mux 3 Decoder

4

/

4

/

7

Data

Buffers

4

/

9

8

8 Analog Inputs

Mux 1

8 T-Switches

1 Series Switch

8

Mux 2

8

Mux 4

EN

EN

Open Drain

Output

CS

WR

SALVO

I/O

RS

One of Four Blocks of Logic/Latches Shown

FIGURE 12.

Control Circuitry

Decoders/

Drivers

APPLICATIONS

WR

SALVO

DG884

RESET

RS

Two—Si584

Quad Unity-Gain Buffers

CLC410

75 W

75 W

FIGURE 13.

Fully Buffered 8 X 4 Crosspoint

Note: DIS outputs are used to

power down the Si582 amplifiers.

x2

x2

x2

x2

x1

x1

x1