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.