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Low-Capacitance, 2/3/4/6-Channel, ±15kV ESD
Protection Arrays for High-Speed Data Interfaces
V C = V CC + V F ( ) + ? L 1 x
?
? ? + ? ? L 2 x
Detailed Description
The MAX3202E/MAX3203E/MAX3204E/MAX3206E are
diode arrays designed to protect sensitive electronics
against damage resulting from ESD conditions or tran-
sient voltages. The low input capacitance makes these
?
D 1
For negative ESD pulses:
d(I ESD ) ? ?
dt
d(I ESD ) ?
?
dt ?
? ? + ? ? L 3 x
devices ideal for high-speed data lines. The
MAX3202E, MAX3203E, MAX3204E, and MAX3206E
protect two, three, four, and six channels, respectively.
? ?
? ?
V C = ? ? V F ( D 2 ) + ? L 1 x
d(I ESD ) ? ?
dt
d(I ESD ) ? ?
? ?
dt ? ?
The MAX3202E/MAX3203E/MAX3204E/MAX3206E are
designed to work in conjunction with a device’s intrinsic
ESD protection. The MAX3202E/MAX3203E/MAX3204E/
MAX3206E limit the excursion of the ESD event to
below ±25V peak voltage when subjected to the
Human Body Model waveform. When subjected to the
IEC 61000-4-2 waveform, the peak voltage is limited to
±60V when subjected to Contact Discharge and ±100V
when subjected to Air-Gap Discharge. The device that
where I ESD is the ESD current pulse.
POSITIVE SUPPLY RAIL
L2
is being protected by the MAX3202E/MAX3203E/
MAX3204E/MAX3206E must be able to withstand these
peak voltages plus any additional voltage generated by
the parasitic board.
Applications Information
Design Considerations
Maximum protection against ESD damage results from
proper board layout (see the Layout Recommendations
section and Figure 2). A good layout reduces the para-
sitic series inductance on the ground line, supply line,
and protected signal lines.
PROTECTED
LINE
L1
D1
I/O_
D2
L3
GROUND RAIL
The MAX3202E/MAX3203E/MAX3204E/MAX3206E ESD
diodes clamp the voltage on the protected lines during
an ESD event and shunt the current to GND or V CC . In
Figure 1. Parasitic Series Inductance
an ideal circuit, the clamping voltage, V C , is defined as
the forward voltage drop, V F , of the protection diode
plus any supply voltage present on the cathode.
For positive ESD pulses:
V C = V CC + V F
For negative ESD pulses:
V C = -V F
V CC
L1
PROTECTED LINE
NEGATIVE ESD
CURRENT
PULSE
L2
In reality, the effect of the parasitic series inductance
on the lines must also be considered (Figure 1).
For positive ESD pulses:
PATH TO
GROUND
D1
I/O_
V C
PROTECTED
CIRCUIT
D2
GND
Figure 2. Layout Considerations
L3
4
_______________________________________________________________________________________
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