The Si8400 is bidirectional for both SCL and SDA. Besides SCL and SDA signal isolation, many designs also require additional system status and control signals, such as resets and interrupt lines, to be isolated. The use of monolithic I2C isolators with additional unidirectional channels allows the system designer to simplify timing challenges in a design. Instead of being forced to isolate additional status and control channels in multiple isolator or opto-coupler packages (which results in significant part-to-part timing variations), monolithic I2C isolators with extra unidirectional channels exhibit timing characteristics that track very closely across process, voltage and temperature variations. The Si8405 has two additional unidirectional channels that are useful for isolating reset and interrupt signals. I2C design does not have to be a mystery. By considering each of these design tips and choosing an isolator appropriate to the demands, designers can easily implement I2C in their products.