Single-channel Isolated 24-V to 60-V digital input receiver for digital input modules
The ISO1211 and ISO1212 devices are isolated 24-V to 60-Vdigital input receivers, compliant to IEC 61131-2 Type 1, 2, and 3 characteristics. These devicesenable 9-V to 300-V DC and AC digital input modules in programmable logic controllers (PLCs),motor-control, grid infrastructure, and other industrial applications. Unlike traditionaloptocoupler solutions with discrete, imprecise current limiting circuitry, theISO121x devices provide asimple, low-power solution with an accurate current limit to enable the design of compact andhigh-density I/O modules. These devices do not require field-side power supply and are configurableas sourcing or sinking inputs.
The ISO121x devicesoperate over the supply range of 2.25 V to 5.5 V, supporting 2.5-V, 3.3-V, and 5-V controllers. A±60-V input tolerance with reverse polarity protection helps ensure the input pins are protected incase of faults with negligible reverse current. These devices support up to 4-Mbps data ratespassing a minimum pulse width of 150 ns for high-speed operation. The ISO1211 device is ideal for designsthat require channel-to-channel isolation and the ISO1212 device is ideal formultichannel space-constrained designs.
The ISO121x devicesreduce component count, simplify system design, improve performance, and reduce board temperaturescompared to traditional solutions. For details, refer to the How To Simplify Isolated 24-V PLC Digital Input ModuleDesigns TI TechNote, How To Improve Speed and Reliability of Isolated Digital Inputs in MotorDrives TI TechNote, and How to Design Isolated Comparators for ±48V, 110V and 240V DC and ACDetection TI TechNote.