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PROTECTION PRODUCTS

PROTECTION PRODUCTS

SDC15

Device Connection for Protection of One Data Line

The SDC15 is designed to protect one data or I/O line

operating at +/- 12 volts. Connection options are as

follows:

l

Common mode protection: Pin 1 is connected to

the data line and pin 2 is connected to ground. For

best results, this pin should be connected directly

to a ground plane on the board. The path length

should be kept as short as possible to minimize

parasitic inductance. Pin 3 is not connected.

l

Differential protection: Pin 1 is connected to one

line and pin 2 is connected to the second line. Pin

3 is not connected.

Circuit Board Layout Recommendations for Suppres-

sion of ESD.

Good circuit board layout is critical for the suppression

of fast rise-time transients such as ESD. The following

guidelines are recommended:

l

Place the SDC15 near the input terminals or

connectors to restrict transient coupling.

l

Minimize the path length between the SDC15 and

the protected line.

l

Minimize all conductive loops including power and

ground loops.

l

The ESD transient return path to ground should be

kept as short as possible.

l

Never run critical signals near board edges.

l

Use ground planes whenever possible.

Device Schematic & Pin Configuration

RS-232 Transceiver Protection Example

Applications Information