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 V_PK 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 V_CC / 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.

• 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

• Integrated isolated power
• No
• Number of channels (#)
• 1
• Forward/reverse channels
• 1 forward / 0 reverse
• 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

ISO722的完整型号有：ISO722D、ISO722DR，以下是这些产品的关键参数及官网采购报价：

ISO722D，工作温度：-40 to 125，封装：SOIC (D)-8，包装数量MPQ：75个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网ISO722D的批量USD价格：1.941（1000+）

ISO722DR，工作温度：-40 to 125，封装：SOIC (D)-8，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网ISO722DR的批量USD价格：1.654（1000+）

DIGI-ISO-EVM — Universal digital isolator evaluation module

DIGI-ISO-EVM 是一个评估模块，用于评估 TI 采用以下五种不同封装的任何单通道、双通道、三通道、四通道或六通道数字隔离器器件：8 引脚 NB SOIC (D)、8 引脚 WB SOIC (DWV)、16 引脚 WB SOIC (DW)、16 引脚 Ultra WB SOIC (DWW) 和 16 引脚 QSOP (DBQ) 封装。此 EVM 具有足够的 Berg 引脚选项，支持使用超少的外部元件来评估相应器件。