General Description
The ADuM1252 offers 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 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.
The ADuM1252 features independent 1.71V to 5.5V
supplies on both side 1 and side 2 of the isolator. The
device operates up to 2MHz. The ultra-low standby
current of 21μA per side is ideal for battery-operated
systems.
The ADuM1252 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 a I2C stop
condition before connecting side 1 and side 2.
The ADuM1252 is available in an 8-pin narrow SOIC
package. The device is rated for operation at ambient
temperatures of -40°C to +125°C.

Benefits and Features
• Low VOL(MAX) for Greater I2C Device Compatibility
• Side 1: 0.69V
• Side 2: 0.4V
• Ultra-Low Power Consumption for Longer Battery
Life
• 142μA (typ) per Channel at 400kHz
• Wide Independent VDD1/VDD2 Supply Range
Supports More Logic Voltage Levels and Allows
Level Shifting
• 1.71V to 5.5V for Both Sides
• Enhanced Hot-Swappable Side 2 I/O
• Initial Side 2 Connection Occurs at Bus Idle or
Stop States to Prevent Data Corruption
• Bidirectional I2C Data Transfer up to 2MHz SCL
• Bidirectional SCL for Advanced Bus Topologies
• Supports Clock Stretching and Multiple
Controllers Across Isolation Barrier
• Strong Current Sinking Enables Lower RPULL-UP
Values for Faster Bus Speeds
• Side 1: 5mA
• Side 2: 50mA
• Robust Galvanic Isolation of Digital Signals
• Continuously Withstands (VIOWM)
- 8-Narrow SOIC: 445VRMS
• Withstands ±10kV Surge per IEC 61000-4-5
• Creepage and Clearance
- 8-Narrow SOIC: 4mm
• Safety and Regulatory Approvals (Pending)
• IEC60747-17 (Pending)
- Reinforced VIORM Narrow SOIC: 630VPEAK
• UL 1577 (Pending)
- 8-Narrow SOIC: 3000VRMS for 1min
• IEC/EN/CSA 62368-1 (Pending)
• IEC/EN/CSA 61010-1 (Pending
• CAN/CSA-C22.2 No. 14-18 (Pending)

Key Applications
• Isolated I2C/SMBus Interface
• Battery Management Systems
• Power Over Ethernet (PoE)
• Motor Control Systems