MAX22191AUT+T

Specialized ICS Overview

The MAX22191AUT+T is an IEC 61131-2 compliant industrial digital input device in a 6-lead SOT-23 package. It translates 24V or 48V switching signals to CMOS-level outputs or drives optocouplers with a typical 2.3mA current. Powered parasitically from the field signal, it features ultra-low quiescent current (100µA typ) and fast response times of 250ns maximum propagation delay. The device operates reliably within -60V to +60V input ranges and supports auxiliary VCC supply for enhanced performance.

Specialized ICS Feature Summary

• IEC 61131-2 Type 1 and Type 3 compliant for 24V/48V inputs
• Parasitic power from field signal eliminates external field-side supply
• Ultra-fast 250ns max propagation delay for high-speed applications
• Integrated TEST pin for safety diagnostics without affecting input current

Specialized ICS Applications

• Process Automation
• Industrial Automation
• Motor Controls
• Individually Isolated Inputs
• Current Sourcing Inputs

Specialized ICS Procurement Notes

Verify the component matches the specific suffix AUT+T for tape-and-reel packaging and lead-free compliance. Confirm availability status as distribution channels may report limited stock. Ensure ordering aligns with the manufacturer's official documentation for the correct RoHS-compliant variant.

Specialized ICS Selection Notes

Select this part when designing circuits requiring IEC 61131-2 compliance with minimal power dissipation. Use the parasitic power mode by connecting VCC to GND for standard operation. Connect VCC to a 3.0V–5.5V source if lower propagation delay and CMOS output levels are required. Ensure REXT is set to 40.2kΩ ±1% for accurate current limiting.

Specialized ICS Part Context

The MAX22191 belongs to Maxim Integrated’s family of ultra-low-power digital input devices. It is designed specifically for harsh industrial environments, offering robust protection against surges up to 60V. The device simplifies interface design between field sensors and programmable logic controllers by integrating current steering and voltage comparison functions.

Specialized ICS Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. Designers should evaluate other IEC 61131-2 compliant digital input isolators from Analog Devices or Maxim Integrated based on package compatibility and electrical specifications.

Specialized ICS FAQ

How does the MAX22191 handle power consumption?

It is primarily parasitically powered from the input signal, drawing only 100µA typical quiescent current when driving an optocoupler. An auxiliary VCC supply can be used to reduce propagation delay.

What is the function of the TEST pin?

The TEST pin allows for safety diagnostics. When IN is high, toggling TEST verifies that OUT toggles correctly without affecting the input current.

Can the MAX22191 operate with 48V inputs?

Yes, it is compliant with 48V inputs when external voltage-dropping resistors are added to the circuit configuration.