TI isolators improve transient immunity, switching performance

The ISO1540 and ISO1541 employ a unique capacitive isolation technology with a silicon dioxide barrier (SiO2) to separate logic input and output buffers. This approach extends the lifetime of the isolators by more than three times compared to optocouplers or magnetic isolators. The ISO1540 provides two isolated bidirectional channels for clock and data lines for use in applications that have multiple masters. The ISO1541 includes a bidirectional data and a unidirectional clock channel for use in single-master applications. The I²C isolator family joins TI’s portfolio of long-lifetime digital isolation products, including devices with isolated CAN or RS-485 interface; isolated amplifiers; or other isolated functions for industrial applications.

Key highlights: 

• Lowest power: With maximum current of less than 8.5 mA at 5 V, the ISO1540 and ISO1541 reduce power consumption by up to 38 percent compared to competitive ICs, reducing heat generation in industrial applications.
• Fastest switching time: Maximum propagation delay of 62 nanoseconds is 52-percent better than competitive ICs, enabling faster data transfer.
• Higher reliability: ± 50-kV/us typical transient immunity provides better reliability in harsh environments.
• Prevents internal logic latch: Isolated bidirectional communications is accomplished within these devices by employing an offset configuration that prevents device latch-up and ensures reliable operation.

The ISO1540 and ISO1541 are available in industry-standard, 8-pin SOIC packages. Suggested retail pricing in 1,000-unit quantities is US$2.00 and US$1.80, respectively.