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Maxim Integrated

Industrial Digital I/O Interface ICs

Make your digital IO interface simpler but stronger

Maxim Integrated industrial digital I/O ICs (also called binary signals) perform voltage level translation while providing circuit protection. Many also perform data serialization to allow economical operation through digital signal isolators.

Digital input and output ICs typically range in magnitude from 0 to 24V. Digital I/O signals are used by industrial automation and control equipment, operating in harsh and noisy environments, to communicate on/off status between remote devices and controllers.

Peripheral Module


The Maxim Integrated MAX14914 peripheral module provides the hardware to evaluate the MAX14914 high-side/push-pull driver that operates as both an industrial digital output (DO) and an industrial digital input (DI).

MAX14914PMB Features

  • Easy Evaluation of the MAX14914
  • Configurable as a Digital Input or a High-Side or Push-Pull Digital Output
  • Accurate Internal Current Limiter for Types 1, 2, and 3 Digital Inputs
  • Support High-Side Current Up to 1.3A with External 24V Supply
  • Adjustable Short-Circuit Current Limit
  • Safe-Demagnetization for Safe Turn Off of Unlimited Inductance
  • Works with USB2PMB1 Adapter and Munich GUI Software
  • Fully Assembled and Tested
  • Proven PCB Layout
  • RoHS Compliant

MAX14914PMB Applications

  • Configurable Digital Input/Output
  • Industrial Digital Outputs and Inputs Modules
  • Motor Control
  • Safety Systems

Parasitically Powered Digital Input


The Maxim Integrated MAX22191 Industrial Digital Input (DI) device that translates a 24V digital industrial input to a 2.4mA (typ) current for driving optical isolators. IEC 61131-2 compliant, the MAX22191 features voltage thresholds and current levels compliant with Type 1 and Type 3 inputs, while minimizing power dissipation. The MAX22191 is also compliant with 48V inputs, with the addition of external resistors.The MAX22191 features robust functionality for harsh industrial systems and is capable of normal operation with input signals ranging from -60V to +60V. Integrated thermal shutdown further protects the device when VCC is present. The MAX22191 is available in a small, 6-lead SOT23 package and operates over the -40°C to +125°C ambient temperature range.

MAX22191 Features

  • High Integration for Flexible Circuit Designs
  • Reduced Power and Heat Dissipation
  • Robust Design
  • Operates from -60V to +60V Input Voltage
  • -40°C to +125°C Ambient Operating Temperature

MAX22191 Applications

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

Quad-Channel Industrial Digital Output, Digital Input


The Maxim Integrated MAX14906 is a high-speed, four-channel industrial digital output, digital input device that can be configured on a per-channel basis as a high-side (HS) switch, push-pull (PP) driver, or a Type 1 and 3, or Type 2 digital input. IEC 61131-2 compliant, the MAX14906 is specified for operation with a supply voltage up to 40V and is tolerant to 65V.

The MAX14906 has a high-side switch current limiting that is settable from 130mA to 1.2A with the option of 2x load inrush current. The high-side driver on-resistance is 120mΩ (typ) at 25°C ambient temperature. Optional push-pull operation allows high speed driving of cables and fast discharge of load capacitance. For digital input operation, current sinks for 2.3mA (Type 1 and 3) or 7mA (Type 2) are provided. The MAX14906 is available in a compact 48-pin 7mm x 7mm QFN package.

MAX14906 Features

  • Per-Channel Configurability Enables Wide Range of Applications
  • Fault Tolerant with Built-In Diagnostics
  • High Integration Reduces BOM Count and PCB Space
  • Reduced Power and Heat Dissipation
  • Robust Design

MAX14906 Applications

  • Industrial Digital Output and Input Module
  • Configurable Digital Input/Output
  • Motor Control
  • PLC Systems
  • Distributed Control Systems (DCS)

High-Side Switch Controller with Current Limiting


The Maxim Integrated MAX14922 is a high-side, n-channel FET controller for implementing industrial high-side switches for switching ground-connected loads. The MAX14922 controls an external nMOS power transistor, allowing low RON high-side switch applications from a +9V to +70V supply range.

The MAX14922 features an on-chip comparator enabling monitoring of the high-side switch output or the supply input voltage with a user-selected threshold. An integrated charge pump enables high speed switching rates when using low RON FETs in the 20kHz to 50kHz range. The MAX14922 is available in a 3mm x 3mm, 16-TQFN package. The MAX14922 device is specified over the -40°C to +125°C operating temperature range.

MAX14922 Features

  • +9V to +70V Operating Supply Range
  • 5V / 50mA Integrated Linear Regulator
  • -40°C to +125°C Ambient Temperature Operating Range
  • 16-TQFN Package, 3mm x 3mm, 0.5mm Pin Pitch
  • Robust Design Features
  • Fault Monitoring Diagnostic Features

MAX14922 Applications

  • Industrial Digital Outputs
  • High-Side Switches
  • Motor Holding Brakes
  • Relay and Solenoid Drivers