1 Features
• Functional Safety-Capable (Planned)
– Documentation available to aid IEC 61508
system design
• Up to 150Mbps data rate
• Robust SiO2 isolation barrier:
– High lifetime at up to 1061VRMS and 1500VDC
working voltage
– Up to 5000VRMS isolation rating
– Up to 10.4kV surge capability
– Up to ±200kV/μs minimum CMTI
– Wide temperature range: –40°C to 125°C
ambient operating
• Supply range: 2.25V to 5.5V
• Overvoltage Tolerant Inputs
• Default output high ( ISO644x ) and low
( ISO644xF ) options
• Low propagation delay: 10ns maximum at 5V,
12ns maximum at 3.3V
• Supports SPI up to: 25MHz at 5V, 20.8MHz at
3.3V
• Low pulse width distortion: 1.8ns maximum at 5V,
2.2ns maximum at 3.3V
• Robust electromagnetic compatibility (EMC)
– System-level ESD, EFT, and surge immunity
– Low emissions
• Wide-SOIC (DW-16) Package
• Wide-SSOP (DFP-16) Package
• SSOP (DBQ-16) Package
• Safety-Related Certifications (Planned):
– DIN EN IEC 60747-17 (VDE 0884-17)
– UL 1577 component recognition program
– IEC 62368-1, IEC 61010-1, IEC 60601-1 and
GB 4943.1 certifications

2 Applications
• Power supplies
• Grid, Electricity meter
• Motor drives
• Factory automation
• Building automation
• Lighting
• Appliances

3 Description
The ISO644x devices are general purpose digital
isolators designed for applications requiring up to
5000VRMS isolation rating per UL 1577. The devices
are also certified by VDE, TUV, CSA, and CQC.
The ISO644x devices provide high EMC performance
while isolating CMOS or LVCMOS digital I/Os.
ISO644x uses SiO2 as the isolation barrier. Each
isolation channel has a logic input and output buffer
separated by the insulation barrier. These devices
come with enable pins that can be used to put the
respective outputs in high impedance.
The ISO6440 and ISO6440F devices have all
channels in the forward direction. The ISO6441
and ISO6441F devices have one reverse-direction
channel. The ISO6442 and ISO6442F devices have
two reverse-direction channels.
In the event of input power or signal loss, the default
output is high for devices without the suffix F and
low for devices with the suffix F. See the Device
Functional Modes section for further details.