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Hot Swappable, Dual I

C Isolators

Data Sheet

ADuM1250/ADuM1251

Rev. H Document Feedback

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FEATURES

Bidirectional I

C 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

IORM

= 560 V peak

APPLICATIONS

Isolated I

C, SMBus, or PMBus interfaces

Multilevel I

C interfaces

Power supplies

Networking

Power over Ethernet

Hybrid electric vehicle battery management

FUNCTIONAL BLOCK DIAGRAMS

ENCODE DECODE

DECODE ENCODE

ENCODE DECODE

DECODE ENCODE

DD1

SDA

SCL

GND

DD2

SDA

SCL

GND

6113-001

Figure 1. ADuM1250

ENCODE DECODE

DECODE ENCODE

DD1

SDA

SCL

GND

DD2

SDA

SCL

GND

06113-002

Figure 2. ADuM1251

GENERAL DESCRIPTION

The ADuM1250/ADuM1251

are hot swappable digital isolators

with nonlatching, bidirectional communication channels that

are compatible with I

C interfaces. This eliminates the need for

splitting I

C signals into separate transmit and receive signals

for use with standalone optocouplers.

The ADuM1250 provides two bidirectional channels, supporting

a complete isolated I

C 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 I

C interface to be implemented in a small form factor.

Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329.

Summary of content (16 pages)

PAGE 1
Hot Swappable, Dual I2C Isolators ADuM1250/ADuM1251 Data Sheet VDD1 1 DECODE ENCODE 8 VDD2 SDA1 2 ENCODE DECODE 7 SDA2 SCL1 3 DECODE ENCODE 6 SCL2 GND1 4 ENCODE DECODE 5 GND2 06113-001 FUNCTIONAL BLOCK DIAGRAMS Bidirectional I2C communication Open-drain interfaces Suitable for hot swap applications 30 mA current sink capability 1000 kHz operation 3.0 V to 5.
PAGE 2
ADuM1250/ADuM1251 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 ESD Caution...................................................................................7 Applications ....................................................................................... 1 Pin Configuration and Function Descriptions..............................8 Functional Block Diagrams .....................................................
PAGE 3
Data Sheet ADuM1250/ADuM1251 SPECIFICATIONS ELECTRICAL CHARACTERISTICS DC Specifications 1 All minimum/maximum specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications are at TA = 25°C, VDD1 = 3.3 V or 5 V, and VDD2 = 3.3 V or 5 V, unless otherwise noted. Table 1. Parameter ADuM1250 Input Supply Current, Side 1, 5 V Input Supply Current, Side 2, 5 V Input Supply Current, Side 1, 3.3 V Input Supply Current, Side 2, 3.
PAGE 4
ADuM1250/ADuM1251 Data Sheet AC Specifications1 All minimum/maximum specifications apply over the entire recommended operating range, unless otherwise noted. All typical specifications are at TA = 25°C, VDD1 = 3.3 V or 5 V, and VDD2 = 3.3 V or 5 V, unless otherwise noted. Refer to Figure 5. Table 2. Parameter MAXIMUM FREQUENCY OUTPUT FALL TIME 5 V Operation Symbol tf1 tf2 Side 1 Output (0.9 VDD1 to 0.9 V) Side 2 Output (0.9 VDD2 to 0.
PAGE 5
Data Sheet ADuM1250/ADuM1251 PACKAGE CHARACTERISTICS Table 3. Parameter Resistance (Input to Output)1 Capacitance (Input to Output)1 Input Capacitance IC Junction to Case Thermal Resistance, Side 1 IC Junction to Case Thermal Resistance, Side 2 1 Symbol RI-O CI-O CI θJCI θJCO Min Typ 1012 1.0 4.
PAGE 6
ADuM1250/ADuM1251 Data Sheet DIN V VDE V 0884-10 (VDE V 0884-10) INSULATION CHARACTERISTICS This isolator is suitable for reinforced isolation only within the safety limit data. Maintenance of the safety data is ensured by protective circuits. The asterisk (*) marking on the package denotes DIN V VDE V 0884-10 approval for a 560 V peak working voltage. Table 6.
PAGE 7
Data Sheet ADuM1250/ADuM1251 ABSOLUTE MAXIMUM RATINGS Ambient temperature = 25°C, unless otherwise noted. ESD CAUTION Table 8. Parameter Storage Temperature (TST) Ambient Operating Temperature (TA) A Grade S Grade Supply Voltages (VDD1, VDD2)1 Input/Output Voltage, Side 1 (VSDA1, VSCL1)2 Side 2 (VSDA2, VSCL2) 2 Average Output Current per Pin2 Side 1 (IO1) Side 2 (IO2) Common-Mode Transients3 Rating −55°C to +150°C −40°C to +105°C −40°C to +125°C −0.5 V to +7.0 V −0.5 V to VDD1 + 0.5 V −0.
PAGE 8
ADuM1250/ADuM1251 Data Sheet VDD1 1 SDA1 2 SCL1 3 GND1 4 ADuM1250/ ADuM1251 TOP VIEW (Not to Scale) 8 VDD2 7 SDA2 6 SCL2 5 GND2 06113-004 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 4. ADuM1250/ADuM1251 Pin Configuration Table 9. ADuM1250 Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 Mnemonic VDD1 SDA1 SCL1 GND1 GND2 SCL2 SDA2 VDD2 Description Supply Voltage, 3.0 V to 5.5 V. Data Input/Output, Side 1. Clock Input/Output, Side 1. Ground 1. Ground reference for Isolator Side 1.
PAGE 9
Data Sheet ADuM1250/ADuM1251 TEST CONDITIONS R1 R1 SDA1 SCL1 CL1 CL1 GND1 VDD2 1 DECODE ENCODE 8 2 ENCODE DECODE 7 3 DECODE ENCODE 6 4 ENCODE DECODE 5 Figure 5. Timing Test Diagram Rev.
PAGE 10
ADuM1250/ADuM1251 Data Sheet APPLICATIONS INFORMATION FUNCTIONAL DESCRIPTION STARTUP The ADuM1250/ADuM1251 interface on each side to a bidirectional I2C signal. Internally, the I2C interface is split into two unidirectional channels communicating in opposing directions via a dedicated iCoupler isolation channel for each. One channel (the bottom channel of each channel pair shown in Figure 6) senses the voltage state of the Side 1 I2C pin and transmits its state to its respective Side 2 I2C pin.
PAGE 11
Data Sheet ADuM1250/ADuM1251 TYPICAL APPLICATION DIAGRAM CAPACITIVE LOAD AT LOW SPEEDS Figure 9 shows a typical application circuit including the pull-up resistors required for both Side 1 and Side 2 buses. Bypass capacitors with values from 0.01 μF to 0.1 μF are required between VDD1 and GND1 and between VDD2 and GND2. The 200 Ω resistor shown in Figure 9 is required for latch-up immunity if the ambient temperature can be between 105°C and 125°C.
PAGE 12
ADuM1250/ADuM1251 Data Sheet MAGNETIC FIELD IMMUNITY The ADuM1250/ADuM1251 are extremely immune to external magnetic fields. The limitation on the magnetic field immunity of the ADuM1250/ADuM1251 is set by the condition in which induced voltage in the receiving coil of the transformer is sufficiently large to either falsely set or reset the decoder. The following analysis defines the conditions under which this may occur.
PAGE 13
Data Sheet ADuM1250/ADuM1251 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 8 1 5 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 6.20 (0.2441) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.
PAGE 14
ADuM1250/ADuM1251 Data Sheet NOTES Rev.
PAGE 15
Data Sheet ADuM1250/ADuM1251 NOTES Rev.
PAGE 16
ADuM1250/ADuM1251 Data Sheet NOTES I2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). ©2006–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06113-0-7/15(H) Rev.