ADuM1252 Bidirectional I2C Isolators

Analog Devices Inc. ADuM1252 Bidirectional I²C Isolators offer two bidirectional, open-drain channels for applications (such as I²C) that require data to be transmitted in both directions on the same line. To prevent latch-up action, Side 1 outputs comprise special buffers to regulate the logic-low voltage at 0.64V, and the input logic-low threshold is at least 50mV lower than the output logic-low voltage. Side 2 provides conventional buffers that do not regulate the logic-low output voltage. The ultra-low-power Vishay ADuM1252 also provides a disturbance-free bus connection for hot-plug connections on Side 2 by first pre-charging the bus pins and then monitoring the bus state for either an idle bus or detection of an I²C stop condition before connecting Sides 1 and 2.