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Analog Devices Inc. ADuM1253 Ultra-Low-Power I2C Digital Isolators offer two open-drain channels, one unidirectional and one bidirectional. This two-channel design targets applications such as I2C that require data to be transmitted in both directions on the same line but have a unidirectional clock. To prevent latch-up action, Side 1 outputs comprise special buffers that 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 features conventional buffers that do not regulate logic-low output voltage. ADuM1253 is rated for operation at ambient temperatures within -40°C to +125°C and packaged in an 8-pin narrow SOIC package.
The ADuM1253 features independent 1.71V to 5.5V supplies on both Side 1 and Side 2 of the isolator. The device operates up to 2MHz, and the ultra-low 21µA standby current per side is ideal for battery-operated systems. The Analog Devices ADuM1253 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 Side 1 and Side 2.
