Quad Industrial Sink/Source Digital Input

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

* 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