Product details

Integrated isolated power No Number of channels (#) 2 Forward/reverse channels 1 forward / 1 reverse Isolation rating (Vrms) 2500 Data rate (Max) (Mbps) 25 Rating High Temp Surge voltage capability (Vpk) 4000 Operating temperature range (C) -55 to 175 Default output High Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.8 Propagation delay (Typ) (ns) 36
Integrated isolated power No Number of channels (#) 2 Forward/reverse channels 1 forward / 1 reverse Isolation rating (Vrms) 2500 Data rate (Max) (Mbps) 25 Rating High Temp Surge voltage capability (Vpk) 4000 Operating temperature range (C) -55 to 175 Default output High Supply voltage (Max) (V) 5.5 Supply voltage (Min) (V) 2.8 Propagation delay (Typ) (ns) 36
SOIC (D) 8 19 mm² 4.9 x 3.9
  • 1-, 5- and 25-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
  • 4000-Vpeak Isolation, 560 Vpeak VIORM
    • UL 1577 Approved
    • 50-kV/µs Typical Transient Immunity
  • Operates with 3.3-V or 5-V Supplies
  • 4-kV ESD Protection
  • High Electromagnetic Immunity
  • 1-, 5- and 25-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
  • 4000-Vpeak Isolation, 560 Vpeak VIORM
    • UL 1577 Approved
    • 50-kV/µs Typical Transient Immunity
  • Operates with 3.3-V or 5-V Supplies
  • 4-kV ESD Protection
  • High Electromagnetic Immunity

The ISO7221 is a dual-channel digital isolator. To facilitate PCB layout, the channels are oriented in the opposite directions. This device has a logic input and output buffer separated by TI’s silicon-dioxide (SiO2) isolation barrier, providing galvanic isolation of up to 4000 V. Used in conjunction with isolated power supplies, this device blocks high voltage, isolates grounds, and prevents 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(3). The A-, B- 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 VCC/2 input thresholds and do not have the input noise-filter and the additional propagation delay.

This device requires two supply voltages of 3.3 V, 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3-V supply and all outputs are 4-mA CMOS.

The ISO7221 is characterized for operation over the ambient temperature range of –55°C to 175°C.

The ISO7221 is a dual-channel digital isolator. To facilitate PCB layout, the channels are oriented in the opposite directions. This device has a logic input and output buffer separated by TI’s silicon-dioxide (SiO2) isolation barrier, providing galvanic isolation of up to 4000 V. Used in conjunction with isolated power supplies, this device blocks high voltage, isolates grounds, and prevents 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(3). The A-, B- 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 VCC/2 input thresholds and do not have the input noise-filter and the additional propagation delay.

This device requires two supply voltages of 3.3 V, 5 V, or any combination. All inputs are 5-V tolerant when supplied from a 3.3-V supply and all outputs are 4-mA CMOS.

The ISO7221 is characterized for operation over the ambient temperature range of –55°C to 175°C.

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Technical documentation

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Type Title Date
* Data sheet Dual Digital Isolator . datasheet (Rev. A) 01 Oct 2012
* Radiation & reliability report ISO7221HD Reliability Report (Rev. A) 17 Aug 2012
White paper Why are Digital Isolators Certified to Meet Electrical Equipment Standards? 16 Nov 2021
White paper Distance Through Insulation: How Digital Isolators Meet Certification Requiremen 11 Jun 2021
EVM User's guide Universal Digital Isolator Evaluation Module 04 Mar 2021
White paper Improve Your System Performance by Replacing Optocouplers with Digital Isolators (Rev. A) 07 Dec 2020
Technical article How to select the right digital isolator for your design 21 Oct 2020
Technical article Why signal isolation matters in 48-V HEV/EV systems 20 Nov 2019
Technical article Staying on budget: How digital isolators are transforming field transmitters 24 May 2019
Technical article What are isolated digital inputs? 08 Mar 2019
Application note Considerations for Selecting Digital Isolators 24 Jul 2018

Design & development

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Evaluation board

DIGI-ISO-EVM — Universal digital isolator evaluation module

DIGI-ISO-EVM is an evaluation module (EVM) used to evaluate any of the TI single-channel, dual-channel, triple-channel, quad-channel or six-channel digital isolator devices in five different packages - 8-pin narrow-body SOIC (D), 8-pin wide-body SOIC (DWV), 16-pin wide-body SOIC (DW), 16-pin ultra- (...)

Simulation model

ISO7221 IBIS Model

SLLM208.ZIP (13 KB) - IBIS Model
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SOIC (D) 8 View options

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