MAX9940

19-4168; Rev 0; 2/09 Signal-Line Overvoltage Protector for Low-Voltage Devices www.datasheet4u.com General Description ♦ 28V Protection on EXT ♦ Extended ESD Protection ±4kV IEC 61000-4 Contact on EXT Features MAX9940 The MAX9940 signal-line overvoltage protector for lowvoltage 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. ♦ +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 PART MAX9940AXK+ Ordering Information TEMP RANGE -40°C to +125°C PINPACKAGE 5 SC70 TOP MARK ATC +Denotes a lead(Pb)-free/RoHS-compliant package. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. Block Diagram/Typical Application Circuit NOTEBOOK VDD = 3.3V ADAPTER LOAD NOTEBOOK BATTERY CHARGER ENABLE VCC MAX9940 MICROCONTROLLER 2kΩ + PROTECTION CIRCUIT...