3 Description

The ISOW644x family of devices are galvanically-isolated quad-channel digital isolator with an integrated high-efficiency power converter with best in class emissions. The integrated DC-DC converter provides up to 550mW of isolated power, eliminating the need for a separate isolated power supply in space-constrained isolated designs.

The high-efficiency of the power converter allows for operation at a wide operating ambient temperature range of –55°C to 125°C. The ISOW644x has been designed with enhanced protection features in mind, including soft-start to limit inrush current, over-voltage and under-voltage lock out, overload and short-circuit protection, and thermal shutdown.

The ISOW644x family of devices provide high electromagnetic immunity while isolating CMOS or LVCMOS digital I/Os. The signal-isolation channel has a logic input and output buffer separated by a silicon dioxide (SiO₂) insulation barrier, whereas, power isolation uses on-chip transformers separated by thin film polymer as insulating material. There are five orderable configurations of four channel ISOW644x device using the last part number digit to note the number of reverse channels. For example, the ISOW6440 device has 4 forward channels and 0 reverse channels, while the ISOW6443 device has 1 forward channel and 3 reverse channels. If the input signal is lost, the default output is high for the ISOW644x devices without the F suffix and low for the ISOW644x devices with the F suffix. ISOW644xV can operate with different supply voltages on V_DDL and V_DD pins. These devices support 2.25V to 5.5V logic supply on V_DDL pin, that can be independent from the power converter supply (V_DD) of 3V to 5.5V.