Packaging information
| Package | Pins SOIC (DFM) | 20 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 850 | LARGE T&R |
Features for the ISOW7721
- 100Mbps data rate
- Integrated DC-DC converter with
low-emissions, low-noise
- Emissions optimized to meet CISPR 32 and EN 55032 Class B with >5dB margin on 2 layer board
- Low frequency power converter at 25MHz enabling low noise performance
- Low output ripple: 24mV
- High efficiency output power
- Efficiency at max load: 46%
- Up to 0.55W output power
- VISOOUT accuracy of ± 5%
- 5V to 5V: Max available load current = 110mA
- 5V to 3.3V: Max available load current = 140mA
- 3.3V to 3.3V: Max available load current = 60mA
- Support for multi-ISOW7721 chain to increase system power output to > 1W and > 200mA
- Independent power supply for channel isolator
& power converter
- Logic supply (VIO): 1.71V to 5.5V
- Power converter supply (VDD): 3V to 5.5V
- Robust electromagnetic compatibility (EMC)
- System-level ESD, EFT, and surge immunity
- ±8kV IEC 61000-4-2 contact discharge protection across isolation barrier
- High CMTI: 100kV/µs (typical)
- Safety Related Certifications:
- VDE reinforced insulation per 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
- Extended temperature range: –40°C to +125°C
- 20-pin wide body SOIC package
Description for the ISOW7721
The ISOW7721 device is a galvanically-isolated dual-channel digital isolator with an integrated high-efficiency power converter with low 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 isolation designs. If additional power is needed, the ISOW7721 supports multi-device chaining, increasing the integrated power output to > 1W using two devices in a system.
The high-efficiency of the power converter allows for operation at a wide operating ambient temperature range of –40°C to +125°C. This device provides improved emissions performance, allowing for simplified board design and has provisions for ferrite beads to further attenuate emissions. The ISOW7721 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 ISOW7721 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 double capacitive silicon dioxide (SiO2) insulation barrier, whereas, power isolation uses on-chip transformers separated by thin film polymer as insulating material. The ISOW7721 has 1 forward channel and 1 reverse channel. If the input signal is lost, the default output is high for the ISOW7721 device without the F suffix and low for the ISOW7721F with the F suffix. The ISOW7721 can operate from a single supply voltage of 3V to 5.5V by connecting VIO and VDD together on a PCB. If lower logic levels are required, these devices support 1.71V to 5.5V logic supply (VIO) that can be independent from the power converter supply (VDD) of 3V to 5.5V. VISOIN and VISOOUT need to be connected on board with either a ferrite bead or fed through a LDO.
These devices help prevent noise currents on data buses, such as UART, RS-485, RS-232, and CAN, or other circuits from entering the local ground and interfering with or damaging sensitive circuitry. Through remarkable chip design and layout techniques, electromagnetic compatibility of the device has been significantly enhanced to ease system-level ESD, EFT, surge and emissions compliance. The device is available in a 20-pin SOIC wide-body (SOIC-WB) DFM package.