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High-Speed, Octal, Industrial Digital Input with Parallel Output

Industry's Smallest, Robust, Octal Digital Input with Parallel Output

Product Details

The MAX22195 translates eight 24V industrial digital inputs to eight CMOS-compatible, parallel outputs. Propagation delay from input-to-output is less than 300ns for all channels. Current-limiters on each digital input greatly 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 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.

The MAX22195 provides a 3.3V integrated voltage regulator. The internal LDO accepts the field supply VDD24 from 7V to 65V. The internal LDO output can supply up to 25mA of current in addition to powering the basic MAX22195 requirements. This MAX22195 LDO current can be used to power digital isolators and other field-side circuits. Alternatively, the MAX22195 can be powered from a 3.0V to 5.5V supply connected to VDD3 pin.

The MAX22195 includes an open-drain READY output that asserts high to indicate the MAX22195 is functional. If the VDD24 field-side supply voltage is too low, or a fault in the current-setting resistor is detected, or the device reaches an over-temperature condition, the READY signal is set to high-impedance.

Key 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
    • 5mm x 5mm, 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 Overtemperature Monitor
    • Current-Setting Resistor Monitor
  • Configurability Enables 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 Minimum 1kΩ Resistor
    • ±8kV Contact ESD and ±15kV Air Gap ESD Using Minimum 1kΩ Resistor
    • -40°C to +125°C Ambient Operating Temperature

Applications/Uses

  • Building Automation
  • Industrial Automation
  • Process Automation
  • Programmable Logic Controllers
Parametric specs for Digital I/O
Digital Input/Output Digital Input
Interface Type Parallel
# Channels 8
VSUPPLY (V) (min) 7
VSUPPLY (V) (max) 65
ISUPPLY (µA) (typ) 0.6
Digital Input Type Type 1
Type 2
Type 3
Min. Detectable Field Input Pulse Width (µs) 3
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/32
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Simplified Block Diagram

MAX22195: Functional/Block Diagram MAX22195: Functional/Block Diagram Zoom icon

Technical Docs

Design & Development

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Description

The MAX22195 evaluation kit (EV kit) provides the hardware necessary to evaluate the MAX22195 high-speed, octal, industrial digital input with parallel output device. The MAX22195 EV kit provides terminal blocks for all 8 inputs and a header for all 8 outputs for easy monitoring and evaluation. Eight field-side LEDs are provided to indicate the input status, and a READY LED to indicate the MAX22195 is operating normally.

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Features

  • Easy Evaluation of the MAX22195
  • Parallel Output for Simultaneous Signal Delivery
  • Configurable External VDD24 Voltage Monitoring
  • Configured for IEC 61131-2 Type 1, 3
  • Robust Design ±2kV Surge Tolerant Line-to-Line
  • Withstand ±8kV Contact ESD, ±15kV Air Gap ESD
  • Fully Assembled and Tested
  • Proven PCB Layout
  • RoHS Compliant

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SIMULATION MODELS

MAX22195 IBIS Model

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Parameters

Parametric specs for Digital I/O

Key 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
    • 5mm x 5mm, 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 Overtemperature Monitor
    • Current-Setting Resistor Monitor
  • Configurability Enables 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 Minimum 1kΩ Resistor
    • ±8kV Contact ESD and ±15kV Air Gap ESD Using Minimum 1kΩ Resistor
    • -40°C to +125°C Ambient Operating Temperature

Applications/Uses

  • Building Automation
  • Industrial Automation
  • Process Automation
  • Programmable Logic Controllers

Description

The MAX22195 translates eight 24V industrial digital inputs to eight CMOS-compatible, parallel outputs. Propagation delay from input-to-output is less than 300ns for all channels. Current-limiters on each digital input greatly 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 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.

The MAX22195 provides a 3.3V integrated voltage regulator. The internal LDO accepts the field supply VDD24 from 7V to 65V. The internal LDO output can supply up to 25mA of current in addition to powering the basic MAX22195 requirements. This MAX22195 LDO current can be used to power digital isolators and other field-side circuits. Alternatively, the MAX22195 can be powered from a 3.0V to 5.5V supply connected to VDD3 pin.

The MAX22195 includes an open-drain READY output that asserts high to indicate the MAX22195 is functional. If the VDD24 field-side supply voltage is too low, or a fault in the current-setting resistor is detected, or the device reaches an over-temperature condition, the READY signal is set to high-impedance.

Simplified Block Diagram

MAX22195: Functional/Block Diagram MAX22195: Functional/Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal