Analog Devices MAX22195 High-Speed Octal Industrial Digital Input translates eight 24V industrial digital inputs to eight CMOS-compatible, parallel outputs. The propagation delay from input to output is less than 300ns for all channels. Current limiters on each digital input significantly reduce power dissipation compared to traditional resistive inputs. The accuracy of these current limiters minimizes power dissipation while ensuring compliance with the IEC 61131-2 standard. A current-setting resistor allows the Analog Devices MAX22195 to be configured for Type 1, Type 2, or Type 3 inputs. Additionally, the MAX22195 has energyless field-side LED drivers to meet the indicator light requirement of IEC 61131-2 with no additional power dissipation.
Features
High-speed, industrial digital inputs
300ns maximum propagation delay
±10ns maximum channel-to-channel skew
Parallel output for simultaneous signal delivery
High integration reduces BOM count and board space
Operates directly from field supply (7V to 65V)
Compatible with 3.3V or 5V logic
5mmx5mm, 32-TQFN package
Low power and low heat dissipation
Low quiescent current (1.2mA maximum)
Accurate input current-limiters
Energyless field-side LED drivers
Fault-tolerant with built-in diagnostics
Integrated field-side supply monitor
Integrated over-temperature monitor
Current-setting resistor monitor
Configurability enables a wide range of applications
Configurable IEC 61131-2 Types 1, 2, 3 inputs
Configurable input current limiting from 0.56mA to 3.97mA
Robust design
±1kV surge tolerant using a minimum 1kΩ resistor
±8kV contact ESD and ±15kV air gap ESD using a minimum 1kΩ resistor
-40°C to +125°C ambient operating temperature
Applications
Programmable Logic Controllers
Industrial automation
Process automation
Building automation
Functional Block Diagram
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