ADUM1251_15 Datasheet, PDF (1/16 Pages) Analog Devices – Hot Swappable, Dual IC Isolators

Data Sheet
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, 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
FUNCTIONAL BLOCK DIAGRAMS
V_DD1 1
SDA₁ 2
SCL₁ 3
GND₁ 4
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Figure 1. ADuM1250
8 V_DD2
7 SDA₂
6 SCL₂
5 GND₂
V_DD1 1
SDA₁ 2
SCL₁ 3
GND₁ 4
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Figure 2. ADuM1251
8 V_DD2
7 SDA₂
6 SCL₂
5 GND₂
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.
1 _{Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.}
Rev. G
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