Signal_line_circuit_protectors_fault_protected_switches

Published:2009/7/23 22:28:00 Author:Jessie | From:SeekIC

Figures 2-34 and 2-35 show a typical application circuit and pin configuration, respectively, for the MAX366. Pin configurations for the MAX337 are shown in Fig.2-36. These ICs are multiple, two-terminal circuit protectors. Placed in series with signal lines, each two-terminal device protects sensitive circuit components from damaging voltage near and beyond the normal supply range. The ICs are used at interfaces where sensitive circuits connect to the external world, and potentially damaging voltage (up to 135 V beyond the supply rails) might be encountered during power-up, power-down, or fault conditions. The ICs can be used to protect either analog or digital signals using unipolar (5 V to 44 V) or bipolar (±5 V to±22 V) supplies. The ICs are essentially fault-protected switches that are always on when power is applied. On resistance is 100Ω (max.), and leakage is less than 1nA at +25℃. When signal voltages exceed, or are within 1.5 V of the supply voltages, or when power, is off, the two-terminal resistance increases and becomes a virtual open circuit. This ensures low current during fault conditions. The protected side of the switch maintains the correct polarity and clamps about 1.5 V below the supply rail. There are no glitches or polarity reversals going into or coming out of a fault condition. ESD (electrostatic discharge) protection is greater than 2 kV.MAXIM NEW RELEASES DATA Book, 1995, P. 1-109, 1-110.



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