High-voltage industrial digital input (DI) and digital output (DO) signals, also called binary signals, are control signals that range in magnitude from 0 to 24V. Digital I/O signals are used in industrial control equipment to communicate on/off status between remote devices and controllers in relatively noisy industrial environments.
Our industrial digital I/O ICs perform voltage level translation while providing circuit protection. Many also perform serialization to allow economical operation through digital signal isolators.
Industrial digital input (DI) ICs provide the interface between high-voltage signals (from binary sensors) and lower voltages found in industrial control equipment such as PLCs. Our IEC61131-2-compliant digital input interface devices offer the smallest solution size, the lowest power dissipation, and the most robust operation with 1kV of surge protection and integrated diagnostics. Our parasitically powered digital input IC reduces power dissipation by up to 60 percent and does not require a discrete isolated power supply.
Industrial Octal Digital Inputs 
Parasitically Powered Digital Inputs
Isolated ADC
All Digital Input Level Translators/Serializers
Industrial digital output (DO) ICs provide high-speed switching of high-voltage output signals for use in industrial control applications. Our digital output drivers feature very low on-resistance to reduce power dissipation and increase channel density, integrated surge protection, diagnostics, and safe demagnetization to safely handle inductive loads. For maximum flexibility, they can be configured in either serial (SPI) or parallel modes with outputs as either high-side switches or push-pull drivers.
Peripheral module boards (PMBs) provide an easy way to evaluate our digital IO devices.
PMB Key Features
| Device Type | Device Evaluated | Device Description | Peripheral Module Board |
|---|---|---|---|
| Digital Input | MAX22190 | 8-Channel Industrial Digital Input with Diagnostics | MAX22190PMB |
| Digital Input | MAX22191 | Single-Channel Parasitically Powered Digital Input | MAX22191PMB |
| Digital Output | MAX14912 | 8-Channel High-Speed, Digital Output Driver | MAX14912PMB |
| Digital IO | MAX14914 | Single-Channel Driver, Configurable as DI or DO | MAX14914PMB |
| Binary Input | MAX14001 | Isolated 10-bit ADC for Multi-Range Binary Inputs With Integrated DC-DC Converter | MAX14001PMB |
| Companion Board | Device Evaluated | Description | Board Number |
|---|---|---|---|
| Adapter Board | - | Low cost, easy to use USB-to-I2C/SPI/GPIO interface adapter board | USB2GPIO |
| Isolation Board | MAX14483 | Provide isolation between the USB adapter board and any peripheral module board | USB2GPIOISO |
Also See:
Digital Signal Isolators ›
IO-Link Transceivers and Binary Drivers ›
Go-IO PLC: Ultra-Portable IO On-the-Go ›
| Type | ID | Title | |
|---|---|---|---|
| User Guide | 6815 |  | Industrial Digital IO Design Guide |
| Application Note | 6339 | | Digital Output Drivers: Understanding Key Features and Challenges |
| Application Note | 6307 | | Switching Inductive Loads with Safe Demagnetization |
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