1. Products
  2. Interface and Isolation
  3. Industrial I/O
  4. Digital I/O
  5. MAX22190


Features and Benefits

  • High Integration Reduces BOM Count and Board Space
    • Eight Input Channels with Serializer
    • Operates Directly from Field Supply (7V to 65V)
    • Compatible with 3.3V or 5V Logic
    • 5mm x 5mm TQFN Package
  • Reduced Power and Heat Dissipation
    • Accurate Input-Current Limiters
    • Energyless Field-Side LED Drivers
  • Fault Tolerant with Built-In Diagnostics
    • Input Protection to ±40V with Low-Input Leakage Current
    • Wire Break Detection
    • Integrated Field-Supply Voltage Monitors
    • Integrated Overtemperature Monitors
    • 5-Bit CRC Code Generation and Transmission for Error Detection
  • Configurability Enables Wide Range of Applications
    • Configurable IEC 61131-2 Type 1, 2, 3 Inputs
    • Configurable Input Current-Limiting from 0.5mA to 3.4mA
    • Selectable Input Debounce Filtering
  • Robust Design
    • ±8kV Contact ESD and ±15kV Air Gap ESD Using Minimum 1kΩ Resistor
    • ±1kV Surge Tolerant Using Minimum 1kΩ Resistor
    • -40°C to +125°C Ambient Operating Temperature

Product Details

The MAX22190 is an IEC 61131-2 compliant industrial digital input device. The MAX22190 translates eight, 24V current-sinking, industrial inputs to a serialized SPI-compatible output that interfaces with 3V to 5.5V logic. A current setting resistor allows the MAX22190 to be configured for Type 1, Type 2, or Type 3 inputs. Field wiring is verified for proximity switches, by a second threshold detector on each input. When wire-break is enabled, the active-low FAULT output is asserted and a register flag is set if the input current drops below the wire-break threshold for more than 20ms. Additional diagnostics that assert the active-ow FAULT pin include: overtemperature, low 24V field supply, 24V field supply missing, CRC communication error, etc.

For robust operation in industrial environments, each input includes a programmable glitch filter. The filter delay on each channel can be independently programmed to one of eight values between 50μs and 20ms, or filter bypass.

The MAX22190 has a 4-pin SPI interface and in addition uses the active-low LATCH input for synchronizing input data across multiple devices in parallel.

MAX22190 field-side accepts a single 7V to 65V supply to VDD24 pin. When powered by the field supply, MAX22190 generates a 3.3V output from an integrated LDO regulator, which can provide up to 25mA of current for external loads in addition to powering the MAX22190. Alternatively, MAX22190 can be powered from a 3.0V to 5.5V logic side supply connected to VDD pin. For flexibility, the SPI interface operates at 3.3V or 5V logic levels as controlled by the VL pin.

Design Solution: Industrial Digital Inputs: They’re Not Quite as Simple as Counting from 0 to 1 ›


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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (3)

Tools & Simulations

IBIS Models

Software Development

Reference Designs (2)

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
MAX22190ATJ+ Material Declaration Reliability Data 32-LFCSP-5X5X0.75
MAX22190ATJ+T Material Declaration Reliability Data 32-LFCSP-5X5X0.75
Wafer Fabrication Data MAX22190 Reliability Data

PCN-PDN Information

Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

Sample & Buy

Ordering FAQs

See our Ordering FAQs for answers to questions about online orders, payment options and more.


Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help


Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.