ADUM1253ASA+

ADUM1253ASA+ is an ultra-low-power, I2C isolator with unidirectional SCL, extended VDD, idle-bus hot-swap, and low VOL. It offers two open-drain channels, one unidirectional and one bidirectional, for 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 output logic-low voltage. Side 2 features conventional buffers that do not regulate logic-low output voltage. It provides a disturbance-free bus connection for hot-plug connections on side 2 by first precharging 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. Applications include isolated I2C/SMBus interface, battery management systems, Power Over Ethernet (PoE), and motor control systems.

• Low VOL(MAX) for greater I2C compatibility, ultra-low-power consumption for longer battery life
• Wide independent VDD1/VDD2 supply range supports more logic voltage levels and allows level shifting
• 1.71V to 5.5V for both sides
• Hot-swappable side 2 I/O prevents data corruption
• Initial side 2 connection occurs at bus idle or stop states
• Strong current sinking enables lower RPULL-UP values for faster bus speeds
• Robust galvanic isolation of digital signals, withstands ±10kV surge per IEC 61000-4-5
• Common-mode transient immunity is 200kV/µs minimum
• 8 narrow SOIC package
• Temperature range from -40 to 125°C