Datasheet
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APPLICATION INFORMATION
0.1µF
USB
Controller
R
T
V
BUS
D+
D–
GND
V
BUS
D+
D–
GND
IO5
IO6
GND
IO2
IO3
IO4
D1
IO1
V
CC
OpenOpen
Detailed Description
TPD6E004
LOW-CAPACITANCE 6-CHANNEL ± 15-kV ESD PROTECTION ARRAY
FOR HIGH-SPEED DATA INTERFACES
SLLS799A – FEBRUARY 2008 – REVISED FEBRUARY 2008
When placed near the connector, the TPD6E004 ESD solution offers little or no signal distortion during normal
operation due to low IO capacitance and ultra-low leakage current specifications. The TPD6E004 ensures that
the core circuitry is protected and the system is functioning properly in the event of an ESD strike. For proper
operation, the following layout/design guidelines should be followed:
1. Place the TPD6E004 solution close to the connector. This allows the TPD6E004 to take away the energy
associated with ESD strike before it reaches the internal circuitry of the system board.
2. Place a 0.1- µ F capacitor very close to the V
CC
pin. This limits any momentary voltage surge at the IO pin
during the ESD strike event.
3. Make sure that there is enough metallization for the V
CC
and GND loop. During normal operation, the
TPD6E004 consumes nA leakage current. But during the ESD event, V
CC
and GND may see 15 A to 30 A of
current, depending on the ESD level. Sufficient current path enables safe discharge of all the energy
associated with the ESD strike.
4. Leave the unused IO pins floating.
5. The V
CC
pin can be connected in two different ways:
a. If the V
CC
pin is connected to the system power supply (a 0.1- µ F capacitor at V
CC
is recommended for
ESD bypass), the TPD6E004 works as a transient voltage suppressor for any signal swing above V
CC
+
V
d
.
b. If the V
CC
pin is not connected to system power supply (a 0.1- µ F capacitor is still recommended at the
V
CC
pin for ESD bypass), the TPD6E004 can tolerate higher signal swing in the range up to V
BR
. Note
that initially the bypass capacitor is charged by the signals through clamp diode.
6 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TPD6E004