General Description
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.

Features
♦ 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

Applications
   Notebook Computers
   Portable Devices
   Industrial Equipment