Signal-Line Overvoltage Protector for Low-Voltage Devices

The MAX9940 signal-line overvoltage protector for low-voltage digital communication ports provides protection against high-voltage faults and ESD strikes. The MAX9940 is especially useful for sensitive communication protocols such as Maxim 1-Wire® that cannot afford standard means of fault protection, such as large series resistors or large line capacitances.

The MAX9940 operates from a single supply voltage of +2.2V to +5.5V and consumes only 13µA of quiescent supply current. The EXT port is protected up to 28V. The device features a reaction time of 60ns for fast action during fault conditions and operates over the -40°C to +125°C automotive temperature range.

Applications

* Industrial Equipment * Notebook Computers * Portable Devices

* 28V Protection on EXT

* Extended ESD Protection

* ±4kV IEC 61000-4 Contact on EXT

* +2.2V to +5.5V Supply Voltage Range

* 13µA Quiescent Supply Current

* 60ns Fault Reaction Time

* Small, 5-Pin SC70

* -40°C to +125°C Temperature Range