Hot-Swappable, Dual I2C Isolators, 5 kV
ADuM2250/ADuM2251
GENERAL DESCRIPTION
FEATURES
Bidirectional I2C communication
Open-drain interfaces
Suitable for hot-swap applications
30 mA current sink capability
1000 kHz operation
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
Wide body, 16-lead SOIC package with >8 mm creepage
High temperature operation: 105°C
Safety and regulatory approvals
The ADuM2250 provides two bidirectional channels support-
ing 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.
UL recognition (pending)
5000 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A
VDE Certificate of Conformity
The ADuM2250/ADuM2251 contain hot-swap circuitry to
prevent data glitches when an unpowered card is inserted
onto an active bus.
DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
V
IORM = 846 V peak
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 semiconductor circuitry to enable a complete, isolated
I2C interface in a small form-factor package.
APPLICATIONS
Isolated I2C, SMBus, or PMBus Interfaces
Multilevel I2C interfaces
Power supplies
Networking
Power-over-Ethernet
1 Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329; other patents
pending.
FUNCTIONAL BLOCK DIAGRAMS
1
16
15
14
13
12
1
16
15
14
13
12
GND
GND
NC
V
GND
GND
NC
V
1
2
1
2
ADuM2250
ADuM2251
2
3
4
5
2
NC
NC
3
V
V
DD1
NC
DD2
DD1
DD2
4
5
ENCODE
DECODE
ENCODE
DECODE
DECODE
ENCODE
ENCODE
ENCODE
DECODE
DECODE
NC
NC
DECODE
ENCODE
DECODE
ENCODE
NC
SDA
SCL
GND
SDA
SDA
SDA
1
1
1
2
1
1
1
2
SCL
SCL
SCL
6
7
8
11
10
9
6
7
8
11
10
9
2
2
GND
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
Rev. 0
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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.
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