1 Features

1• IEEE 1394 Live Insertion Detection

• ESD Protection Exceeds IEC61000-4-2 (Level 4)

– ±15-kV Human-Body Model (HBM)

– ±6-kV IEC 61000-4-2 Contact Discharge

• 4-Channel Matching ESD Clamps for High-Speed

Differential Lines

• Flow-Through, Single-in-Line Pin Mapping

Simplifies Board Layout

• Available in an 8-Pin X2SON (DQL) package

2 Applications

Firewire Interface

3 Description

The TPD4S1394 provides robust system level ESD

solution for the IEEE 1394 port, along with a live

insertion detection mechanism for high-speed lines

interfacing a low-voltage, ESD sensitive core chipset.

This device protects and monitors up to two

differential input pairs. The optimized line capacitance

protects the data lines with data rates in excess of

1.6 GHz without degrading signal integrity.

The TPD4S1394 incorporates a live insertion

detection circuit whose output state changes when

improper voltage levels are present on the input data

lines. The FWPWR_EN signal controls an external

FireWire port power switch. During the live insertion

event if there is a floating GND or a high level signal

at the D+ or D– pins, the internal comparator detects

the changes and pull the FWPWR_EN signal to a low

state. When FWPWR_EN is driven low, there is an

internal delay mechanism preventing it from being

driven to the high state regardless of the inputs to the

comparator.

Additionally, the TPD4S1394 performs ESD

protection on the four inputs pins: D1+, D1–, D2+,

and D2–. The TPD4S1394 conforms to the

IEC61000-4-2 (Level 4) ESD protection and ±15-kV

HBM ESD protection. The TPD4S1394 is

characterized for operation over ambient air

temperature of –40°C to 85°C.

A 0.1-μF decoupling capacitor is required at VCC.