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TPD4E004 датащи(PDF) 6 Page - Texas Instruments

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номер детали TPD4E004
подробное описание детали  4-CHANNEL ESD-PROTECTION ARRAY FOR HIGH-SPEED DATA INTERFACES
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPD4E004 датащи(HTML) 6 Page - Texas Instruments

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APPLICATION INFORMATION
IO3
IO4
GND
IO2
IO1
0.1 µF
V
CC
USB
Controller
R
T
V
BUS
D+
D–
GND
V
BUS
D+
D–
GND
Detailed Description
TPD4E004
4-CHANNEL ESD-PROTECTION ARRAY
FOR HIGH-SPEED DATA INTERFACES
SLVS729A – FEBRUARY 2008 – REVISED FEBRUARY 2008
When placed near the connector, the TPD4E004 ESD solution offers little or no signal distortion during normal
operation due to low I/O capacitance and ultra-low leakage current specifications. The TPD4E004 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 TPD4E004 solution close to the connector. This allows the TPD4E004 to take away the energy
associated with ESD strike before it reaches the internal circuitry of the system board.
2. Place a 0.1-
µF 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 VCC and GND loop. During normal operation, the
TPD4E004 consumes nA leakage current. But during the ESD event, VCC and GND may see 15 µA to 30 µA
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 VCC pin can be connected in two different ways:
a.
If the VCC pin is connected to the system power supply (a 0.1-µF capacitor at VCC is recommended for
ESD bypass), the TPD4E004 works as a transient voltage suppressor for any signal swing above VCC +
Vd.
b.
If the VCC pin is not connected to system power supply (a 0.1-µF capacitor is still recommended at the
VCC pin for ESD bypass), the TPD4E004 can tolerate higher signal swing in the range up to VBR. Note
that initially the bypass capacitor is charged by the signals through clamp diode.
6
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): TPD4E004


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