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
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
A 0.1-µF decoupling capacitor is required at VCC.
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