MAX2244x 4-Channel Digital Isolators Analog Devices MAX2244x 4-Channel Digital Isolators are reinforced, fast, and low-power digital isolators. These devices are designed to transfer digital signals between the circuits with different power domains using 0.74mW per channel at 1Mbps. The MAX22445 isolators offer unidirectional channel configurations to accommodate any 4-channel design that includes SPI, RS-485, and digital I/O applications. These digital isolator channels are always enabled, and the default state of the outputs of these devices is selectable.