MAXIM MAX9940AXK+T

The MAX9940 is a signal-line overvoltage protector for low-voltage devices that provides circuit protection from high-voltage faults and ESD strikes. The device provides protection in digital communication lines such as 1-Wire and I2C protocols where large series resistance and capacitances cannot be used to provide protection due to their impact on VIL/VIH levels and communication timing. The MAX9940 includes a series switch that connects INT to EXT. When a high-voltage fault condition occurs on EXT, the MAX9940 quickly shuts off the series switch and isolates the low-voltage device from the fault condition. In addition to providing DC fault isolation, the MAX9940 also provides up to ±4KV IEC 61000-4 contact ESD protection on EXT. The MAX9940 is ideal for circuits that require low-voltage devices that communicate to the outside world over connector ports that can expose them to hazardous high-voltage DC faults and ESD strikes.

• The MAX9940 signal-line overvoltage protector for low-voltage digital communication ports provides protection against high-voltage faults and ESD strikes.
• 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.
• Features a reaction time of 60ns for fast action during fault conditions.
• Operates over the -40°C to +125°C automotive temperature range.
• 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

• Notebook Computers
• Portable Devices
• Industrial Equipment