Product Description
The CM1224 family of diode arrays has been designed to provide ESD protection for electronic components or subsystems 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 (VP) or negative (VN) supply rail. A Zener diode is embedded between VP and VN, offering two advantages. First, it protects the VCC 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.

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 (VCLAMP) at 10V
• Low Dynamic resistance (RDYN) 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