ISO1212DBQR Description
Isolated 24-V to 60-V digital input receivers that meet the requirements of Types 1, 2, and 3 of IEC 61131-2 are the ISO1211 and ISO1212 devices. These devices provide 9-V to 300-V DC and AC digital input modules in programmable logic controllers (PLCs), motor-control, grid infrastructure, and other industrial applications. The ISO121x devices offer a straightforward, low-power alternative to conventional optocoupler solutions with discrete, inaccurate current limiting circuitry, enabling the development of small, dense I/O modules. These devices can be configured as sourcing or sinking inputs and do not require field-side power supply.
The ISO121x devices support 2.5-V, 3.3-V, and 5-V controllers and work throughout a supply voltage range of 2.25 V to 5.5 V. The input pins are protected in case of failures with low reverse current thanks to a 60-V input tolerance with reverse polarity protection. For high-speed operation, these devices pass pulses with a minimum width of 150 ns at data rates of up to 4 Mbps. The ISO1212 device is appropriate for multichannel space-constrained designs, whereas the ISO1211 device is ideal for designs that call for channel-to-channel isolation.
As comparison to conventional solutions, the ISO121x devices minimize the number of components, simplify the design of the system, improve performance, and lower board temperatures.
ISO1212DBQR Features
Configurable as sourcing or sinking input
High data rates: up to 4 Mbps
Enable pin to multiplex output signals
High transient immunity: ±70-kV/µs CMTI
Wide supply range (VCC1): 2.25 V to 5.5 V
Ambient temperature range: –40°C to +125°C
Compact package options:
– Single-channel ISO1211, SOIC-8
– Dual-channel ISO1212, SSOP-16
– Basic insulation per DIN VDE V 0884-11
– UL 1577 recognition, 2500-VRMS insulation
– IEC 60950-1, IEC 62368-1, IEC 61010-1 and GB 4943.1-2011 certifications
Compliant to IEC 61131-2; Type 1, 2, 3 characteristics for 24-V isolated digital inputs
Supports 9-V to 300-V DC and AC digital input designs using external resistors
Accurate Current Limit for Low-Power Dissipation:
– 2.2 mA to 2.47 mA for Type 3
– Adjustable up to 6.5 mA
Eliminates the need for field-side power supply
High input-voltage range with reverse polarity protection: ±60 V
Wire-break detection (refer to TIDA-01509)
ISO1212DBQR Applications
– Digital Input Modules
– Mixed I/O Modules
