General Description

The ADuM1254 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 ADuM1254 features independent 2.25V to 5.5V

supplies on both side 1 and side 2 of the isolator. The

device operates up to 2MHz.

The ADuM1254 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 ADuM1254 is available in an 8-pin narrow-body

SOIC package. The device is rated for operation at

ambient temperatures of -40°C to +125°C.

Key Applications

? Isolated I2C/SMBus Interface

? Battery Management Systems

? Power Over Ethernet (PoE)

? Motor Control Systems

Benefits and Features

? Low VOL(MAX) for Greater I2C Device Compatibility

? Side 1: 0.69V

? Side 2: 0.4V

? Independent VDD1/VDD2 Supplies Supports 3.3V

and 5V Logic Voltage Levels and Allows Level

Shifting

? 2.25V to 5.5V for Both Sides

? Enhanced Hot Swappable Side 2 I/Os

? 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

? Three Packages with Creepage and Clearance

- 8 Narrow SOIC: 4mm

? Safety and Regulatory Approvals (Pending)

? IEC 60747-17 (Pending)

- Reinforced VIORM Narrow SOIC: 63VPEAK

? 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)