CM1224 Datasheet, PDF (1/14 Pages) ON Semiconductor – 2- and 4-Channel Low Capacitance ESD Protection Arrays

2- and 4-Channel Low Capacitance ESD
Protection Arrays
CM1224
Features
• 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
Applications
• 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
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.
©2010 SCILLC. All rights reserved.
April 2010 – Rev. 3
Publication Order Number:
CM1224/D