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