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MAX3202EEWST Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX3202EEWST Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 9 page 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 devices ideal for high-speed data lines. The MAX3202E, MAX3203E, MAX3204E, and MAX3206E protect two, three, four, and six channels, respectively. 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 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. 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 VCC. In an ideal circuit, the clamping voltage, VC, is defined as the forward voltage drop, VF, of the protection diode plus any supply voltage present on the cathode. For positive ESD pulses: VC = VCC + VF For negative ESD pulses: VC = -VF In reality, the effect of the parasitic series inductance on the lines must also be considered (Figure 1). For positive ESD pulses: For negative ESD pulses: where IESD is the ESD current pulse. VV L x dI dt Lx d C FD ESD () ( =− + ⎛ ⎝⎜ ⎞ ⎠⎟ + () 2 13 II dt ESD) ⎛ ⎝⎜ ⎞ ⎠⎟ ⎛ ⎝⎜ ⎞ ⎠⎟ VV V L x dI dt L CCC FD ESD () =+ + ⎛ ⎝⎜ ⎞ ⎠⎟ + ()1 12 () x dI dt ESD ⎛ ⎝⎜ ⎞ ⎠⎟ Low-Capacitance, 2/3/4/6-Channel, ±15kV ESD Protection Arrays for High-Speed Data Interfaces 4 _______________________________________________________________________________________ L1 PROTECTED LINE L3 D2 GROUND RAIL POSITIVE SUPPLY RAIL I/O_ D1 L2 Figure 1. Parasitic Series Inductance VCC PROTECTED LINE NEGATIVE ESD CURRENT PULSE PATH TO GROUND PROTECTED CIRCUIT GND D1 I/O_ VC D2 L1 L3 L2 Figure 2. Layout Considerations |
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