1 Features
• Robust Isolated Bidirectional, I2C Compatible,
Communication
– ISO1640: Bidirectional SDA and SCL
communication
– ISO1641: Bidirectional SDA and unidirectional
SCL communication
– ISO1642/3/4: Bidirectional SDA and SCL
communication with either 2 or 3 unidirectional
GPIO channels
– Hot-Swappable SDA and SCL
• Bidirectional data transfer up to 1.7 MHz Operation
• Up to 3 additional unidirectional isolated GPIO
channels supporting 50 Mbps speed
• Robust isolation barrier with enhanced EMC:
– >100-year projected lifetime at 450 VRMS
working voltage (D-8) and 1500 VRMS working
voltage (DW-16)
– Up to 5000 VRMS isolation rating per UL1577
– Up to 10 kV reinforced surge capability
– ±100 kV/μs typical CMTI
– ±8 kV IEC-ESD 61000-4-2 contact discharge
protection across isolation barrier
– Same side ±8 kV IEC-ESD unpowered contact
discharge on SCL2 and SDA2 (Side 2)
• Supply range: 3 V to 5.5 V (Side 1) and 2.25 V to
5.5 V (Side 2)
• Open-drain outputs with 3.5-mA (Side 1) and 50-
mA (Side 2) current-sink capability
• Max capacitive load: 80 pF (Side 1) and 400 pF
(Side 2)
• 16-SOIC (DW-16) and 8-SOIC (D-8) Package
Options
• –40°C to +125°C Operating Temperature
• Safety-Related Certifications (planned):
– UL 1577 Component Recognition Program
– DIN VDE V 0884-11
– IEC 62368-1, IEC 61010-1, IEC 60601-1 and
GB4943.1-2011 certifications

2 Applications
• Isolated I2C Buses
• Isolated I2C and SPI Buses
• SMBus and PMBus Interfaces
• Power Over Ethernet (PoE)
• Motor Control Systems
• Battery Management

3 Description
The ISO1640, ISO1641, ISO1642, ISO1643 and
ISO1644 (ISO164x) devices are hot swappable, lowpower,
bidirectional isolators that are compatible
with I2C interfaces. The ISO164x supports UL 1577
isolation ratings of 5000 VRMS in the 16-DW package,
and 3000 VRMS in the 8-D package. Each I2C
isolation channel in this low emissions device has
a logic input and open drain output separated by
a double capacitive silicon dioxide (SiO2) insulation
barrier. The ISO1642 and ISO1643 intregrates 2
unidirectional CMOS isolation channels, while the
ISO1644 intregrates 3 unidirectional CMOS isolation
channels which can be used for static GPIO isolation
or to isolate a Serial Peripheral Interface (SPI) bus.
This family includes basic and reinforced insulation
devices certified by VDE, UL, CSA, TUV and CQC.
The ISO1640/2/3/4 have two isolated bidirectional
channels for clock and data lines and the ISO1641
has a bidirectional data and a unidirectional clock
channel. The ISO164x family integrates logic required
to support bidirectional channels, providing a much
simpler design and smaller footprint when compared
to optocoupler-based solutions.