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NUP2201MR6 데이터시트(PDF) 4 Page - ON Semiconductor

부품명 NUP2201MR6
상세설명  Low Capacitance TSOP?? Diode?뭈VS Array for High Speed Data Lines Protection
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제조업체  ONSEMI [ON Semiconductor]
홈페이지  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NUP2201MR6 데이터시트(HTML) 4 Page - ON Semiconductor

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NUP2201MR6
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VCC
D1
D2
Data Line
IESDpos
IESDneg
VF + VCC
−VF
IESDpos
IESDneg
Power
Supply
Protected
Device
Looking at the figure above, it can be seen that when a
positive ESD condition occurs, diode D1 will be forward
biased while diode D2 will be forward biased when a
negative ESD condition occurs. For slower transient
conditions, this system may be approximated as follows:
For positive pulse conditions:
Vc = Vcc + VfD1
For negative pulse conditions:
Vc = −VfD2
ESD events can have rise times on the order of some
number of nanoseconds. Under these conditions, the effect
of parasitic inductance must be considered. A pictorial
representation of this is shown below.
VCC
D1
D2
Data Line
IESDpos
IESDneg
VC = VCC + Vf + (L diESD/dt)
IESDpos
IESDneg
Power
Supply
Protected
Device
VC = −Vf − (L diESD/dt)
An approximation of the clamping voltage for these fast
transients would be:
For positive pulse conditions:
Vc = Vcc + Vf + (L diESD/dt)
For negative pulse conditions:
Vc = −Vf – (L diESD/dt)
As shown in the formulas, the clamping voltage (Vc) not
only depends on the Vf of the steering diodes but also on the
L diESD/dt factor. A relatively small trace inductance can
result in hundreds of volts appearing on the supply rail. This
endangers both the power supply and anything attached to
that rail. This highlights the importance of good board
layout. Taking care to minimize the effects of parasitic
inductance will provide significant benefits in transient
immunity.
Even with good board layout, some disadvantages are still
present when discrete diodes are used to suppress ESD
events across datalines and the supply rail. Discrete diodes
with good transient power capability will have larger die and
therefore higher capacitance. This capacitance becomes
problematic as transmission frequencies increase. Reducing
capacitance generally requires reducing die size. These
small die will have higher forward voltage characteristics at
typical ESD transient current levels. This voltage combined
with the smaller die can result in device failure.
The ON Semiconductor NUP2201MR6 was developed to
overcome the disadvantages encountered when using
discrete diodes for ESD protection. This device integrates a
TVS diode within a network of steering diodes.
D1
D2
D3
D4
0
NUP2201MR6 Equivalent Circuit
During an ESD condition, the ESD current will be driven
to ground through the TVS diode as shown below.
VCC
D1
D2
Data Line
IESDpos
Power
Supply
Protected
Device
The resulting clamping voltage on the protected IC will
be:
Vc = VF + VTVS.
The clamping voltage of the TVS diode is provided in
Figure 4 and depends on the magnitude of the ESD current.
The steering diodes are fast switching devices with unique
forward voltage and low capacitance characteristics.


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