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Product details

Parameters

Integrated isolated power No Number of channels (#) 1 Forward/reverse channels 1/0 Isolation rating (Vrms) 2500 Data rate (Max) (Mbps) 100 Rating Catalog Surge voltage capability (Vpk) 4000 Current consumption per channel (DC) (Typ) (mA) 4.3 Operating temperature range (C) -40 to 125 Default output High Supply voltage (Max) (V) 5 Supply voltage (Min) (V) 3.3 Propagation delay (Typ) (ns) 17 open-in-new Find other Digital isolators

Package | Pins | Size

SOIC (D) 8 19 mm² 3.91 x 4.9 open-in-new Find other Digital isolators

Features

  • 100 and 150-Mbps Signaling Rate Options
  • Low Propagation Delay
  • Low Pulse Skew
  • Low-Power Sleep Mode
  • High Electromagnetic Immunity
  • Low Input-Current Requirement
  • Failsafe Output
  • Drop-In Replacement for Most Opto and Magnetic
    Isolators
  • Operates from 3.3 V and 5 V Supplies
  • –40°C to 125°C Operating Temperature Range
  • 50 kV/µs Transient Immunity, Typical
  • Safety and Regulatory Approvals
    • VDE Basic Insulation with 4000-VPK VIOTM,
      560 VPK VIORM
    • 2500 VRMS Isolation per UL 1577
    • CSA Approved for Component Acceptance
      Notice 5A and IEC 60950-1
  • APPLICATIONS
    • Industrial Fieldbus
      • Modbus
      • Profibus
      • DeviceNet™ Data Buses
      • Smart Distributed Systems (SDS™)
    • Computer Peripheral Interface
    • Servo Control Interface
    • Data Acquisition

All other trademarks are the property of their respective owners

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Description

The ISO721, ISO721M, ISO722, and ISO722M are digital isolators with a logic input and output buffer separated by a silicon dioxide (SiO2) insulation barrier. This barrier provides galvanic isolation of up to 4000 VPK per VDE. Used in conjunction with isolated power supplies, these devices 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 for more than 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 symmetry of the dielectric and capacitor within the integrated circuitry provides for close capacitive matching, and allows fast transient voltage changes between the input and output grounds without corrupting the output. The small capacitance and resulting time constant provide for fast operation with signaling rates from 0 Mbps (DC) to 100 Mbps for the ISO721 and the ISO722 devices, and 0 Mbps to 150 Mbps with the ISO721M and the ISO722M devices.

These devices require 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 ISO722 and ISO722M devices include an active-low output enable that when driven to a high logic level, places the output in a high-impedance state and turns off internal bias circuitry to conserve power.

Both the ISO721 and ISO722 devices have TTL input thresholds and a noise filter at the input that prevent transient pulses of up to 2 ns in duration from being passed to the output of the device.

The ISO721M and ISO722M devices have CMOS VCC / 2 input thresholds, but do not have the noise-filter and the additional propagation delay. These features of the ISO721M device also provide for reduced-jitter operation.

The ISO721, ISO721M, ISO722, and ISO722M devices are characterized for operation over the ambient temperature range of –40°C to 125°C.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 14
Type Title Date
* Datasheet ISO72x Single Channel High-Speed Digital Isolators datasheet (Rev. L) Oct. 19, 2015
Technical articles Isolation 101: How to find the right isolation solution for your application Feb. 11, 2020
Technical articles Why signal isolation matters in 48-V HEV/EV systems Nov. 20, 2019
More literature CSA Certification (Rev. P) Nov. 19, 2019
More literature VDE certificate for basic isolation for DIN VDE V 0884-11:2017-01 (Rev. Q) Sep. 20, 2019
More literature UL Certification (Rev. N) Jul. 30, 2019
Technical articles Staying on budget: How digital isolators are transforming field transmitters May 24, 2019
Technical articles What are isolated digital inputs? Mar. 08, 2019
Application notes ISO72x Digital Isolator Magnetic-Field Immunity (Rev. B) Aug. 07, 2018
Application notes Digital Isolator Design Guide (Rev. B) Aug. 01, 2018
Application notes High-Voltage Lifetime of the ISO72x Family of Digital Isolators (Rev. A) Aug. 01, 2018
Application notes The ISO72x Family of High-Speed Digital Isolators (Rev. A) Aug. 01, 2018
Application notes Considerations for Selecting Digital Isolators Jul. 24, 2018
User guides ISO72XEVM Jan. 14, 2006

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SIMULATION MODELS Download
SLLC282A.ZIP (15 KB) - IBIS Model

Reference designs

REFERENCE DESIGNS Download
36Vdc-75Vdc Input, 6V @ 20A Output, Active Clamp Forward
PMP4123 — The PMP4123 reference design provides 6V at 120W from a standard 48V telecom input with greater than 94% efficiency. This design uses the UCC2897A active clamp controller along with an ISO721 digital isolator and TPS28225 to drive synchronous rectifiers. The circuit is built in an industry standard (...)

CAD/CAE symbols

Package Pins Download
SOIC (D) 8 View options

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