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ADUM1251 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADUM1251
Beschreibung (ADUM1250 / ADUM1251) Hot Swappable Dual I2C Isolators
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 12 Seiten
ADUM1251 Datasheet, Funktion
www.DataSheet4U.com
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
VDD1 1
SDA1 2
SCL1 3
GND1 4
DECODE
ENCODE
DECODE
ENCODE
ENCODE
DECODE
ENCODE
DECODE
8 VDD2
7 SDA2
6 SCL2
5 GND2
Figure 1. ADuM1250 Functional Block Diagram
VDD1 1
SDA1 2
SCL1 3
GND1 4
DECODE
ENCODE
ENCODE
ENCODE
DECODE
DECODE
8 VDD2
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.






ADUM1251 Datasheet, Funktion
www.DataSheet4U.com
ADuM1250/ADuM1251
DIN EN 60747-5-2 (VDE 0884 PART 2) INSULATION CHARACTERISTICS
This isolator is suitable for basic isolation only within the safety limit data. Maintenance of the safety data is ensured by protective circuits.
The * marking on the package denotes DIN EN 60747-5-2 approval for a 560 V peak working voltage.
Table 6.
Description
Installation Classification per DIN VDE 0110
For Rated Mains Voltage ≤ 150 V rms
For Rated Mains Voltage ≤ 300 V rms
For Rated Mains Voltage ≤ 400 V rms
Climatic Classification
Pollution Degree (DIN VDE 0110, Table 1)
Maximum Working Insulation Voltage
Input-to-Output Test Voltage, Method b1
VIORM × 1.875 = VPR, 100% Production Test, tm = 1 sec, Partial Discharge < 5 pC
Input-to-Output Test Voltage, Method a
After Environmental Tests Subgroup 1
VIORM × 1.6 = VPR, tm = 60 sec, Partial Discharge < 5 pC
After Input and/or Safety Test Subgroup 2/3
VIORM × 1.2 = VPR, tm = 60 sec, Partial Discharge < 5 pC
Highest Allowable Overvoltage (Transient Overvoltage, tTR = 10 sec)
Safety-Limiting Values (Maximum Value Allowed in the Event of a Failure (See also Figure 3)
Case Temperature
Side 1 Current
Side 2 Current
Insulation Resistance at TS, VIO = 500 V
Symbol Characteristic
VIORM
VPR
I to IV
I to III
I to II
40/105/21
2
560
1050
VPR
896
672
VTR 4000
TS 150
IS1 160
IS2 170
RS >109
Unit
VPEAK
VPEAK
VPEAK
VPEAK
°C
mA
mA
Ω
350
300
250
200
150
100
50
0
0 50 100 150 200
CASE TEMPERATURE (°C)
Figure 3. Thermal Derating Curve, Dependence of Safety Limiting Values on
Case Temperature, per DIN EN 60747-5-2
RECOMMENDED OPERATING CONDITIONS
Table 7.
Parameter
Operating Temperature
Supply Voltages1
Input/Output Signal Voltage
Capacitive Load, Side 1
Capacitive Load, Side 2
Static Output Loading, Side 1
Static Output Loading, Side 2
Symbol
TA
VDD1, VDD2
VSDA1, VSCL1, VSDA2, VSCL2
CL1
CL2
ISDA1, ISCL1
ISDA2, ISCL2
Min
−40
3.0
0.5
0.5
1 All voltages are relative to their respective ground. See the Application Notes section for data on immunity to external magnetic fields.
Max
+105
5.5
5.5
40
400
3
30
Unit
°C
V
V
pF
pF
mA
mA
Rev. 0 | Page 6 of 12

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ADUM1251 pdf, datenblatt
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ADuM1250/ADuM1251
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
8
1
5
6.20 (0.2440)
4 5.80 (0.2284)
0.25 (0.0098)
0.10 (0.0040)
1.27 (0.0500)
BSC
1.75 (0.0688)
1.35 (0.0532)
COPLANARITY
0.10
SEATING
PLANE
0.51 (0.0201)
0.31 (0.0122)
0.50 (0.0196) 45°
0.25 (0.0099)
1.27 (0.0500)
0.25 (0.0098) 0.40 (0.0157)
0.17 (0.0067)
ORDERING GUIDE
Model
Number
of Inputs,
VDD1 Side
ADuM1250ARZ1
2
ADuM1250ARZ-RL71 2
ADuM1251ARZ1
2
ADuM1251ARZ-RL71 2
COMPLIANT TO JEDEC STANDARDS MS-012-A A
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
Figure 12. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters (inches)
Number
of Inputs,
VDD2 Side
2
2
1
1
Maximum
Data Rate
(Mbps)
1
1
1
1
Maximum
Propagation
Delay (ns)
150
150
150
150
Temperature
Range
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
−40°C to +105°C
Package
Description
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
8-Lead SOIC_N
Package
Option
R-8
R-8
R-8
R-8
1 Z = Pb-free part.
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06113-0-10/06(0)
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