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ã 2000 Semtech Corp.

www.semtech.com

PROTECTION PRODUCTS

LC01-6

Device Connection Options for Protection of High-

Speed Data Lines

The LC01-6 is designed to protect high-speed data

lines from transient over-voltages which result from

lightning and ESD. The device is designed to protect

one line pair in differential (Line-to-Line) mode. Pins 1-

8 are connected to line 1 and pins 9-16 are connected

to line 2 as shown. All pins should be connected for

best results.

T1/E1 Linecard Protection

A typical long-haul T1/E1 linecard protection circuit is

shown below. The LC01-6 is connected between Tip &

Ring on the transmit and receive line pairs. It provides

protection to metallic (line-to-line) lightning surges per

Bellcore 1089 and FCC Part 68. Depending on the

application, a high voltage crowbar device (not shown)

such as a gas discharge tube (GDT) or TVS Thyristor

may be used to suppress common mode (line-to-

ground) surges. To complete the protection circuit, the

SRDA05-4 (or SRDA3.3-4 for 3.3V supplies) is em-

ployed as the secondary IC side protection element.

This device helps prevent the transceiver from latching

up by providing fine clamping of transients that are

coupled through the transformer. Positive temperature

coefficient (PTC) resistors or fuses are also required for

AC power cross protection. For further information,

reference Semtech application note AN97-10.

Figure 2 - Connection for Differential Protection

(Line-to-Line)

Applications Information

Figure 1 - Schematic and Pin Configuration