RCLAMP0504FATCT datasheet(5/9 Pages) SEMTECH

Part #	RCLAMP0504FATCT

Description	RailClamp짰Low Capacitance TVS Array

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Manufacturer	SEMTECH [Semtech Corporation]

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PROTECTION PRODUCTS

RClamp0504FA

Device Connection Options for Protection of Four

High-Speed Data Lines

This device is designed to protect data lines by

clamping them to a fixed reference. When the voltage

on the protected line exceeds the reference voltage

the steering diodes are forward biased, conducting the

transient current away from the sensitive circuitry.

Data lines are connected at pins 1, 3, 4 and 6. Pin 2

should be connected directly to a ground plane. The

path length is kept as short as possible to minimize

parasitic inductance.

The positive reference is connected at pin 5. The

options for connecting the positive reference are as

follows:

1. To protect data lines and the power line, connect

pin 5 directly to the positive supply rail (V

CC). In this

configuration the data lines are referenced to the

supply voltage. The internal TVS diode prevents

over-voltage on the supply rail.

2. In applications where the supply rail does not exit

the system, the internal TVS may be used as the

reference. In this case, pin 5 is not connected.

The steering diodes will begin to conduct when the

voltage on the protected line exceeds the working

voltage of the TVS (plus one diode drop).

3. In applications where complete supply isolation is

desired, the internal TVS is again used as the

reference and V

CC is connected to one of the I/O

inputs. An example of this configuration is the

protection of a SIM port. The Clock, Reset, I/O,

and VCC lines are connected at pins 1, 3, 4, and 6.

Pin 2 is connected to ground and pin 5 is not

connected.

Matte Tin Lead Finish

Matte tin has become the industry standard lead-free

replacement for SnPb lead finishes. A matte tin finish

is composed of 100% tin solder with large grains.

Since the solder volume on the leads is small com-

pared to the solder paste volume that is placed on the

land pattern of the PCB, the reflow profile will be

determined by the requirements of the solder paste.

Therefore, these devices are compatible with both

lead-free and SnPb assembly techniques. In addition,

unlike other lead-free compositions, matte tin does not

have any added alloys that can cause degradation of

the solder joint.

Protection of Four Data Lines and Power Supply Line

Applications Information

Protection of Four Data Lines Using Internal TVS

Diode as Reference

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