ADUM2251 Datasheet PDF - Analog Devices
| Part Number | ADUM2251 | |
| Description | (ADUM2250 / ADUM2251) Dual I2C Isolators | |
| Manufacturers | Analog Devices | |
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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
VDD1 3
NC 4
DECODE
ENCODE
14 VDD2
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
VDD1 3
NC 4
DECODE
ENCODE
14 VDD2
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
Document Feedback
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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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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
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Data Sheet
ADuM2250/ADuM2251
PACKAGE CHARACTERISTICS
Table 3.
Parameter
Symbol Min Typ Max Unit Test Conditions/Comments
Resistance (Input to Output)1
RI-O
1012 Ω
Capacitance (Input to Output)1
CI-O
2.2 pF f = 1 MHz
Input Capacitance
CI 4.0 pF
IC Junction-to-Ambient Thermal Resistance θJA
45 °C/W Thermocouple located at center of
package underside
1 The device is considered a 2-terminal device; Pin 1 through Pin 8 are shorted together, and Pin 9 through Pin 16 are shorted together.
REGULATORY INFORMATION
The ADuM2250/ADuM2251 are approved by the organizations listed in Table 4.
Table 4.
UL
Recognized under UL 1577
component recognition program1
Single protection, 5000 V rms
isolation voltage
File E214100
CSA
Approved under CSA Component Acceptance Notice #5A
Basic insulation per CSA 60950-1-07 and IEC 60950-1,
600 V rms (849 V peak) maximum working voltage
RW-16 package:
Reinforced insulation per CSA 60950-1-07 and IEC 60950-1,
380 V rms (537 V peak) maximum working voltage
Reinforced insulation per IEC 60601-1, 125 V rms (176 V peak)
maximum working voltage
RI-16-2 package:
Reinforced insulation per CSA 60950-1-07 and IEC 60950-1,
400 V rms (565 V peak) maximum working voltage
Reinforced insulation per IEC 60601-1, 250 V rms (353 V peak)
maximum working voltage
File 205078
VDE
Certified according to DIN V VDE V 0884-10
(VDE V 0884-10):2006-122
Reinforced insulation, 849 V peak
File 2471900-4880-0001
1 In accordance with UL 1577, each ADuM2250/ADuM2251 is proof tested by applying an insulation test voltage ≥ 6000 V rms for 1 sec (current leakage detection limit = 10 µA).
2 In accordance with DIN V VDE V 0884-10 (VDE V 0884-10):2006-12, each ADuM2250/ADuM2251 is proof tested by applying an insulation test voltage ≥ 1590 V peak for 1 sec
(partial discharge detection limit = 5 pC). The asterisk (*) marking branded on the component designates DIN V VDE V 0884-10 (VDE V 0884-10):2006-12 approval.
INSULATION AND SAFETY-RELATED SPECIFICATIONS
Table 5.
Parameter
Rated Dielectric Insulation Voltage
Minimum External Air Gap (Clearance)
Symbol
L(I01)
Value
5000
8.0 min
Unit
V rms
mm
Minimum External Tracking (Creepage)
L(I02)
RW-16 Package
RI-16-2 Package
Minimum Internal Distance (Internal Clearance)
Tracking Resistance (Comparative Tracking Index)
Isolation Group
CTI
7.7 min
8.3 min
0.017 min
>175
IIIa
mm
mm
mm
V
Test Conditions/Comments
1-minute duration
Distance measured from input terminals to output
terminals, shortest distance through air along the
PCB mounting plane, as an aid to PC board layout
Measured from input terminals to output
terminals, shortest distance path along body
Insulation distance through insulation
DIN IEC 112/VDE 0303, Part 1
Material Group (DIN VDE 0110, 1/89, Table 1)
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