ADUM2251_15 Datasheet, PDF (1/16 Pages) Analog Devices – Hot Swappable, Dual IC Isolators, 5 kV

Data Sheet
Hot Swappable, Dual I²C Isolators, 5 kV
ADuM2250/ADuM2251
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
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
Safety and regulatory approvals
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
VIORM = 849 V peak
Qualified for automotive applications
APPLICATIONS
Isolated I²C, SMBus, or PMBus interfaces
Multilevel I²C interfaces
Power supplies
Networking
Power-over-Ethernet
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.
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.
The ADuM2250/ADuM2251 contain hot swap circuitry to
prevent data glitches 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 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.
FUNCTIONAL BLOCK DIAGRAMS
GND₁ 1
NC 2
ADuM2250
16 GND₂
15 NC
V_DD1 3
NC 4
DECODE
ENCODE
14 V_DD2
13 NC
SDA₁ 5
ENCODE
DECODE
12 SDA₂
SCL₁ 6
DECODE
ENCODE
11 SCL₂
GND₁ 7
ENCODE
DECODE
10 NC
NC 8
9 GND₂
NC = NO CONNECT
Figure 1. ADuM2250 Functional Block Diagram
GND₁ 1
NC 2
ADuM2251
16 GND₂
15 NC
V_DD1 3
NC 4
DECODE
ENCODE
14 V_DD2
13 NC
SDA₁ 5
SCL₁ 6
ENCODE
ENCODE
DECODE
DECODE
12 SDA₂
11 SCL₂
GND₁ 7
10 NC
NC 8
9 GND₂
NC = NO CONNECT
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
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