MAX22194

PRODUCTION

Quad Industrial Sink/Source Digital Input

Analog Devices MAX22194 Product Info

10 February 2026 6

Features

Software Configurable
- Four Inputs Individually Configurable as Sink or Source
- Type 1/3, Type 2, TTL, and Hi-Z (HTL) Modes
- Wide Resistor-Settable Accurate Input Current Ranging from 0.5mA to 6.75mA
- Programmable Glitch Filters
- Extensive Diagnostics (Supply Voltage Monitoring, Temperature Alarms, PCB Fault Alarms, Thermal Shutdown)
- Addressable or Daisy-Chain SPI to Reduce Isolation Channels
Robust Solution
- IEC 61000-4-2 ESD Airgap ±15kV and Contact ±8kV with Minimum 680Ω Pulse Resistor at Field Inputs
- IEC 61000-4-5 Surge ±1.2kV/42Ω with Minimum 680Ω Pulse Resistor at Field Inputs
- CRC Error Detection on SPI
- -40°C to +125°C Operating Temperature

Low-Power Dissipation
- Operates from 8V to 36V Field Supply
- Low-Supply Current 2mA Maximum
Compact Solution
- Integrated 5V, 20mA Linear Regulator
- 2.5V to 5.5V Logic Interface
- LED Driver Matrix or GPO Outputs
- 5mm x 5mm 32-Pin TQFN Package

Part details & applications

The MAX22194 is an industrial quad digital input that translates four industrial 24V or TTL level inputs to logic level outputs. The device has a serial interface allowing configuration and reading of serialized data through SPI. The input channels are individually configurable as sinking (p-type) or sourcing (n-type) inputs. Current limiters on each digital input minimize power dissipation while ensuring compliance with the IEC 61131-2 standard. With a single current-setting resistor, the inputs are individually configurable for Type 1/3, Type 2, TTL, or HTL (high-impedance 24V levels). The current sinks or sources can be individually disabled.

Every input channel has a programmable glitch/debounce filter.

The MAX22194 can be powered from a field supply from 8V up to 36V for sink/source operation and has an integrated 5V linear regulator that can provide up to 20mA of load current.

APPLICATIONS

Programmable Logic Controllers
Factory Automation
Process Control

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