Why signal isolation matters in 48-V HEV/EV systems How to select the right digital isolator for your design Universal Digital Isolator Evaluation Module Why are Digital Isolators Certified to Meet Electrical Equipment Standards?ĭistance Through Insulation: How Digital Isolators Meet Certification Requiremen Improve Your System Performance by Replacing Optocouplers with Digital Isolators (Rev. UL Certificate of Compliance File E181974 Vol 4 Sec 1 (Rev. VDE Certificate for Basic Isolation for DIN EN IEC 60747-17 (Rev. ISO722x Dual-Channel Digital Isolators datasheet (Rev. The ISO7220x and ISO7221x family of devices are characterized for operation over the ambient temperature range of –40☌ to +125☌. All inputs are 5-V tolerant when supplied from a 2.8-V or 3.3-V supply and all outputs are 4-mA CMOS. The ISO7220x and ISO7221x family of devices require two supply voltages of 2.8 V (C-Grade), 3.3 V, 5 V, or any combination. The M-option devices have CMOS V CC/2 input thresholds and do not have the input noise filter and the additional propagation delay. The A-option, B-option, and C-option devices have TTL input thresholds and a noise filter at the input that prevents transient pulses from being passed to the output of the device. The small capacitance and resulting time constant provide fast operation with signaling rates available from 0 Mbps (DC) to 150 Mbps (The signaling rate of a line is the number of voltage transitions that are made per second expressed in the units bps). If this dc-refresh pulse is not received every 4 µs, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state. A periodic update pulse is sent across the barrier to ensure the proper dc level of the output. Across the isolation barrier, a differential comparator receives the logic transition information, then sets or resets a flip-flop and the output circuit accordingly. Used in conjunction with isolated power supplies, these devices block high voltage and isolate grounds, as well as prevent noise currents on a data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry.Ī binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation barrier. These devices have a logic input and output buffer separated by TI’s silicon-dioxide (SiO 2) isolation barrier, providing galvanic isolation of up to 4000 V PK per VDE. To facilitate PCB layout, the channels are oriented in the same direction in the ISO7220x and in opposite directions in the ISO7221x. The ISO7220x and ISO7221x family devices are dual-channel digital isolators. Typical 28-Year Life at Rated Voltage (see High-Voltage Lifetime of the ISO72x Family of Digital Isolators and Isolation Capacitor Lifetime Projection).Operates with 2.8-V (C-Grade), 3.3-V, or 5-V Supplies.Low Jitter Content 1 ns Typ at 150 Mbps.Low Pulse-Width Distortion (PWD) 1-ns Max.Low Channel-to-Channel Output Skew 1-ns Max.
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