Hot Swappable, Dual I2C Isolators, 5 kV
Data Sheet
ADuM2250/ADuM2251
FEATURES
Bidirectional I2C communication
Open-drain interfaces
Suitable for hot swap applications
30 mA current sink capability
1000 kHz operation
GENERAL DESCRIPTION
The ADuM2250/ADuM22511 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.
3.0 V to 5.5 V supply/logic levels
16-lead SOIC wide body package version (RW-16)
16-lead SOIC wide body enhanced creepage version (RI-16-2)
High temperature operation: 105°C
The ADuM2250 provides two bidirectional channels, supporting
a complete isolated I2C interface. The ADuM2251 provides one
bidirectional channel and one unidirectional channel for those
applications where a bidirectional clock is not required.
Safety and regulatory approvals
The ADuM2250/ADuM2251 contain hot swap circuitry to
prevent data glitches when an unpowered card is inserted onto
an active bus.
UL recognition: 5000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A (RI-16-2 package)
IEC 60601-1: 250 V rms (reinforced)
IEC 60950-1: 400 V rms (reinforced)
VDE certificate of conformity
DIN V VDE V 0884-10 (VDE V 0884-10):2006-12
These isolators are based on iCoupler® chip scale transformer
technology from Analog Devices, Inc. iCoupler is a magnetic
isolation technology with performance, size, power consump-
tion, and functional advantages compared to optocouplers. The
ADuM2250/ADuM2251 integrate iCoupler channels with semi-
conductor circuitry to enable a complete, isolated I2C interface
in a small form factor package.
V
IORM = 849 V peak
Qualified for automotive applications
APPLICATIONS
Isolated I2C, SMBus, or PMBus interfaces
Multilevel I2C interfaces
Power supplies
Networking
Power-over-Ethernet
FUNCTIONAL BLOCK DIAGRAMS
1
16
15
14
13
12
GND
GND
NC
V
1
2
3
4
5
16
15
14
13
12
GND
GND
NC
V
1
2
1
2
ADuM2251
ADuM2250
2
3
4
5
NC
NC
V
V
DD1
NC
DD2
DD1
NC
DD2
ENCODE
DECODE
DECODE
DECODE
ENCODE
ENCODE
NC
ENCODE
DECODE
ENCODE
DECODE
DECODE
ENCODE
DECODE
ENCODE
NC
SDA
SCL
GND
SDA
SDA
SCL
GND
SDA
1
1
1
2
1
1
1
2
SCL
6
7
8
11
10
9
SCL
6
7
8
11
10
9
2
2
NC
GND
NC
GND
NC
NC
2
2
NC = NO CONNECT
NC = NO CONNECT
Figure 1. ADuM2250 Functional Block Diagram
Figure 2. ADuM2251 Functional Block Diagram
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329; other patents pending.
Rev. C Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
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