GENERAL DESCRIPTION

The ADuM1250/ADuM12511 are hot swappable digital isolators

with nonlatching, bidirectional communication channels that

are compatible with I2C interfaces. This eliminates the need for

splitting I2C signals into separate transmit and receive signals

for use with standalone optocouplers.

The ADuM1250 provides two bidirectional channels, supporting a complete isolated I2C interface. The ADuM1251 provides one

bidirectional channel and one unidirectional channel for applica-

tions where a bidirectional clock is not required.

Both the ADuM1250 and the ADuM1251 contain hot swap

circuitry to prevent glitching data when an unpowered card is

inserted onto an active bus. These isolators are based on the iCoupler? chip scale transformer

technology from Analog Devices, Inc. iCoupler is a magnetic isolation technology with functional, performance, size, and

power consumption advantages as compared to optocouplers.

With the ADuM1250/ADuM1251, iCoupler channels can be

integrated with semiconductor circuitry, which enables a complete

isolated I2C interface to be implemented in a small form factor.

FEATURES

Bidirectional I2C communication Open-drain interfaces

Suitable for hot swap applications

30 mA current sink capability

1000 kHz operation

3.0 V to 5.5 V supply/logic levels 8-lead, RoHS compliant SOIC package

High temperature operation: 125°C Qualified for automotive applications

Safety and regulatory approvals

UL recognition

2500 V rms for 1 minute per UL 1577 CSA Component Acceptance Notice 5A

VDE certificate of conformity DIN V VDE V 0884-10 (VDE V 0884-10):2006-12

VIORM = 560 V peak

APPLICATIONS

Isolated I2C, SMBus, or PMBus interfaces Multilevel I2C interfaces

Power supplies

Networking Power over Ethernet

Hybrid electric vehicle battery management