SLLSEB6A – JULY 2012 – REVISED OCTOBER 2012
Low-Power Bidirectional I
2
C Isolators
Check for Samples:
1
FEATURES
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Isolated Bidirectional, I
2
C Compatible,
Communications
Supports up to 1 MHz Operation
3-V to 5.5-V Supply Range
Open Drain Outputs with 3.5-mA Side 1 and
35-mA Side 2 Sink Current Capability
-40°C to 125°C Operating Temperature
±50 kV/µs Transient Immunity (Typical)
HBM ESD Protection of 4 kV on All Pins;
8 kV on Bus Pins
SAFETY AND REGULATORY
APPROVALS
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4000-V
PK
Isolation per DIN EN 60747-5-2
(VDE 0884 Part 2) (Pending)
2500-V
RMS
Isolation for 1 minute per UL 1577
(Approved)
CSA Component Acceptance Notice 5A
(Approved)
IEC 60950-1 and IEC 61010-1 End Equipment
Standards (Approved)
ISO1540
ISO1541
2
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Isolation
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Isolated I
2
C Bus
SMBus and PMBus Interfaces
Open-drain Networks
Motor Control Systems
Battery Management
I
2
C Level Shifting
SDA1 2
SCL1 3
GND1 4
Side 1
7 SDA2
6 SCL2
5 GND2
Side 2
Isolation
APPLICATIONS
VCC1 1
8 VCC2
VCC1 1
SDA1 2
SCL1 3
GND1 4
Side 1
Side 2
8 VCC2
7 SDA2
6 SCL2
5 GND2
DESCRIPTION
The ISO1540 and ISO1541 are low-power, bidirectional isolators that are compatible with I2C interfaces. These
devices have their logic input and output buffers separated by TI’s Capacitive Isolation technology using a silicon
dioxide (SiO2) barrier. When used in conjunction with isolated power supplies, these devices block high voltages,
isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging
sensitive circuitry.
This isolation technology provides for function, performance, size, and power consumption advantages when
compared to opto-couplers. The ISO1540 and ISO1541 enable a complete isolated I
2
C interface to be
implemented within a small form factor.
The ISO1540 has two isolated bidirectional channels for clock and data lines while the ISO1541 has a
bidirectional data and a unidirectional clock channel. The ISO1541 is useful in applications that have a single
Master while the ISO1540 is ideally fit for multi-master applications.
Isolated bidirectional communications is accomplished within these devices by offsetting the Side 1 Low-Level
Output Voltage to a value greater than the Side 1 High-Level Input Voltage thus preventing an internal logic latch
that otherwise would occur with standard digital isolators.
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
I C is a trademark of NXP B.V Corporation.
Copyright © 2012, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TI [ TEXAS INSTRUMENTS ]
