ISO7021 Ultra-Low-Power 2-Channel Digital Isolator

Texas Instruments' ISO7021 ultra-low-power multi-channel digital isolators can be used to isolate CMOS and LVCMOS digital I/Os. Each isolation channel has a logic input and output buffer separated by a double capacitive silicon dioxide (SiO₂) insulation barrier. Innovative edge-based architecture combined with an ON/OFF keying modulation scheme allows these isolators to consume ultra-low power while meeting 3,000 V_RMS isolation rating per UL1577. The per-channel dynamic current consumption is less than 120 µA/Mbps and the per-channel static current consumption is 4.8 µA at 3.3 V making the ISO7021 suitable in power and thermal-constrained system designs.

These devices can operate as low as 1.71 V, as high as 5.5 V, and are fully functional with different supply voltages on each side of the isolation barrier. The ISO7021 isolators are available in a narrow body 8-SOIC package with one forward-direction and one reverse-direction channel. These devices have default output high and low options. If the input power or signal is lost, the default output is high for the ISO7021 device without the suffix F and low for the ISO7021F device with the F suffix.