2- and 4-Channel Low Capacitance ESD
Protection Arrays
CM1224
Features
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Two or four 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 1.08Ω
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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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
Block Diagram
©2010 SCILLC. All rights reserved.
April 2010 – Rev. 3
Publication Order Number:
CM1224/D
ONSEMI [ ON SEMICONDUCTOR ]
