ADUM1250 Datasheet, PDF (1/12 Pages) Analog Devices – Hot Swappable Dual I2C Isolators

Hot Swappable Dual I²C Isolators
ADuM1250/ADuM1251
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 SOIC lead-free package
High temperature operation: 105°C
Safety and regulatory approvals
UL recognition
2500 V rms for 1 minute per UL 1577
CSA Component Acceptance Notice #5A (pending)
VDE Certificate of Conformity (pending)
DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01
DIN EN 60950 (VDE 0805): 2001-12; DIN EN 60950: 2000
VIORM = 560 V peak
APPLICATIONS
Isolated I²C, SMBus, or PMBus interfaces
Multilevel I²C interfaces
Power supplies
Networking
Power-over-Ethernet
GENERAL DESCRIPTION
The ADuM1250/ADuM1251¹ are hot swappable digital
isolators with non latching bidirectional communication
channels 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 those applications where a bidirectional clock is not
required.
FUNCTIONAL BLOCK DIAGRAMS
V_DD1 1
SDA₁ 2
SCL₁ 3
GND₁ 4
DECODE
ENCODE
DECODE
ENCODE
ENCODE
DECODE
ENCODE
DECODE
8 V_DD2
7 SDA₂
6 SCL₂
5 GND₂
Figure 1. ADuM1250 Functional Block Diagram
V_DD1 1
SDA₁ 2
SCL₁ 3
GND₁ 4
DECODE
ENCODE
ENCODE
ENCODE
DECODE
DECODE
8 V_DD2
7 SDA₂
6 SCL₂
5 GND₂
Figure 2. ADuM1251 Functional Block Diagram
Both the ADuM1250 and ADuM1251 contain hot swap
circuitry to prevent glitching data when an unpowered card is
inserted onto an active bus.
These isolators are based on 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 provided in a small
form factor.
1 _{Protected by U.S. Patents 5,952,849 and 6,873,065. Other patents pending.}
Rev. 0
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 registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone]
©2006 Analog Devices, Inc. All rights reserved.