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NUP4304M6 데이터시트(PDF) 4 Page - ON Semiconductor

부품명 NUP4304M6
상세설명  Low Capacitance Diode Array for ESD Protection in Four Data Lines
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NUP4304M6 데이터시트(HTML) 4 Page - ON Semiconductor

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NUP4304MR6
http://onsemi.com
4
APPLICATIONS INFORMATION
The NUP4304MR6 is a low capacitance diode array
designed
to
protect
sensitive
electronics
such
as
communications
systems,
computers,
and
computer
peripherals against damage due to ESD events or transient
overvoltage conditions. Because of its low capacitance, it
can be used on high speed I/O data lines. The integrated
design of the NUP4304MR6 offers surge rated, low
capacitance steering diodes integrated in a single package
(TSOP−6). If a transient condition occurs, the steering
diodes will drive the transient to the positive rail of the
power supply or to ground.
NUP4304MR6 Configuration Options
The NUP4304MR6 is able to protect up to four data lines
against transient overvoltage conditions by driving them to
a fixed reference point for clamping purposes. The steering
diodes will be forward biased whenever the voltage on the
protected line exceeds the reference voltage (Vf or Vcc+Vf).
The diodes will force the transient current to bypass the
sensitive circuit.
Data lines are connected at pins 1, 3, 4 and 6. The negative
reference is connected at pin 5. This pin must be connected
directly to ground by using a ground plane to minimize the
PCB’s ground inductance. It is very important to reduce the
PCB trace lengths as much as possible to minimize parasitic
inductance.
Option 1
Protection of four data lines using Vcc as reference.
6
5
4
1
2
3
I/O 1
I/O 2
I/O 3
I/O 4
VCC
For this configuration, connect pin 2 directly to the
positive supply rail (Vcc), the data lines are referenced to the
supply voltage. Biasing of the steering diodes reduces their
capacitance.
Option 2
Protection of four data lines and the supply rail using VCC
as a reference and an external TVS diode.
I/O 1
I/O 2
I/O 3
I/O 4
6
5
4
1
2
3
VCC
If additional protection of the supply rail is desired, an
external TVS diode may be added across VCC and ground.
This will prevent overvoltage conditions on the supply rail
protecting the supply and other circuits connected to it.
Option 3
Protection of four data lines with bias and power supply
isolation resistor.
I/O 1
I/O 2
I/O 3
I/O 4
6
5
4
1
2
3
VCC
10 k
The NUP4304MR6 can be isolated from the power supply
by connecting a series resistor between pin 2 and VCC. A
10 k
W resistor is recommended for this application. This
will maintain bias on the internal steering diodes, reducing
their capacitance.


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