ISO1212DBQR

The ISO1211 and ISO1212 devices are isolated 24-V

to 60-V digital input receivers, compliant to IEC

61131-2 Type 1, 2, and 3 characteristics. These

devices enable 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 traditional optocoupler solutions

with discrete, imprecise current limiting circuitry, the

ISO121x devices provide a simple, low-power

solution with an accurate current limit to enable the

design of compact and high-density I/O modules.

These devices do not require field-side power supply

and are configurable as sourcing or sinking inputs.

The ISO121x devices operate 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 in case of faults with negligible reverse

current. These devices support up to 4-Mbps data

rates passing a minimum pulse width of 150 ns for

high-speed operation. The ISO1211 device is ideal

for designs that require channel-to-channel isolation

and the ISO1212 device is ideal for multichannel

space-constrained designs.