ISO7221ADR

The ISO7220x and ISO7221x family devices are dual-channel digital isolators. To facilitate PCB layout, the channels are oriented in the same direction in the ISO7220x and in opposite directions in the ISO7221x. These devices have a logic input and output buffer separated by TI’s silicon-dioxide (SiO₂) isolation barrier, providing galvanic isolation of up to 4000 V_PK per VDE. 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.

A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation barrier. Across the isolation barrier, a differential comparator receives the logic transition information, then sets or resets a flip-flop and the output circuit accordingly. A periodic update pulse is sent across the barrier to ensure the proper dc level of the output. 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.

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). 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 M-option devices have CMOS V_CC/2 input thresholds and do not have the input noise filter and the additional propagation delay.

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. 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 are characterized for operation over the ambient temperature range of –40°C to +125°C.

Key Features

• 1, 5, 25, and 150-Mbps Signaling Rate Options
  • Low Channel-to-Channel Output Skew; 1-ns Max
  • Low Pulse-Width Distortion (PWD); 1-ns Max
  • Low Jitter Content; 1 ns Typ at 150 Mbps
• 50 kV/µs Typical Transient Immunity
• Operates with 2.8-V (C-Grade), 3.3-V, or 5-V Supplies
• 4-kV ESD Protection
• High Electromagnetic Immunity
• –40°C to +125°C Operating Range
• Typical 28-Year Life at Rated Voltage (see High-Voltage Lifetime of the ISO72x Family of Digital Isolators and Isolation Capacitor Lifetime Projection)
• Safety-Related Certifications
  • VDE Basic Insulation with 4000-V_PK V_IOTM, 560 V_PK V_IORM per DIN VDE V 0884-11:2017-01 and DIN EN 61010-1 (VDE 0411-1)
  • 2500 V_RMS Isolation per UL 1577
  • CSA Approved for IEC 60950-1 and IEC 62368-1