2- and 4-Channel Low Capacitance ESD Protection Arrays
Features
•
•
•
•
•
•
•
•
•
•
2 or 4 channels of ESD protection
Provides ESD protection to IEC61000-4-2 Level 4
• ±8kV contact discharge
Low channel input capacitance of 0.7pF typical
Minimal capacitance change with temperature and
voltage
Channel input capacitance matching of 0.02pF
typical is ideal for differential signals
Zener diode protects supply rail and eliminates the
need for external by-pass capacitors
Low clamping voltage (V
CLAMP
) at 10V
Low Dynamic resistance (R
DYN
) at 1.08
Ω
Each I/O pin can withstand over 1000 ESD strikes*
Available in SOT and MSOP lead-free packages
Product Description
The CM1224 family of diode arrays has been designed
to provide ESD protection for electronic components or
sub-systems requiring minimal capacitive loading.
These devices are ideal for protecting systems with
high data and clock rates or for circuits requiring low
capacitive loading. Each ESD channel consists of a
pair of diodes in series which steer the positive or
negative ESD current pulse to either the positive (V
P
)
or negative (V
N
) supply rail. A Zener diode is
embedded between V
P
and V
N
, offering two
advantages. First, it protects the V
CC
rail against ESD
strikes, and second, it eliminates the need for a bypass
capacitor that would otherwise be needed for
absorbing positive ESD strikes to ground. The CM1224
protects against ESD pulses up to
±8kV
per the IEC
61000-4-2 standard.
These devices are particularly well-suited for protecting
systems using high-speed ports such as USB 2.0,
IEEE1394 (Firewire
®
, iLink
™
), Serial ATA, DVI, HDMI
and corresponding ports in removable storage, digital
camcorders, as well as DVD-RW drives and other
applications where extremely low loading capacitance
with ESD protection are required.
The CM1224 family of devices has lead-free finishing
in a small package footprint.
Applications
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•
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USB 2.0 ports at 480Mbps in desktop PCs,
notebooks and peripherals
IEEE1394 Firewire
®
ports at 400Mbps / 800Mbps
DVI ports, HDMI ports in notebooks, set top boxes,
digital TVs, LCD displays
Serial ATA ports in desktop PCs and hard disk
drives
PCI Express ports
General purpose high-speed data line ESD
protection
Electrical Schematics
V
P
CH4
V
P
CH3
CH1
CH2
V
N
CM1224-02SR
CH1
V
N
CH2
CM1224-04SO
CM1224-04MR
*
Standard test condition is IEC61000-4-2 level 4 test circuit with each pin subjected to ±8kV contact discharge for 1000 pulses. Discharges are timed at 1 second intervals and all 1000 strikes are completed in one continuous test
run. The part is then subjected to standard production test to verify that all of the tested parameters are within spec after the 1000 strikes.
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