SLLS629L January   2006  – October 2015 ISO721 , ISO721M , ISO722 , ISO722M

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics, 5 V
    6. 7.6  Electrical Characteristics, 5 V, 3.3 V
    7. 7.7  Electrical Characteristics, 3.3 V, 5 V
    8. 7.8  Electrical Characteristics, 3.3 V
    9. 7.9  Power Dissipation
    10. 7.10 Switching Characteristics, 5 V
    11. 7.11 Switching Characteristics, 5 V, 3.3 V
    12. 7.12 Switching Characteristics, 3.3 V, 5 V
    13. 7.13 Switching Characteristics, 3.3 V
    14. 7.14 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Features Description
      1. 9.3.1 Insulation Characteristics
      2. 9.3.2 IEC 60664-1 Ratings Table
      3. 9.3.3 Regulatory Information
      4. 9.3.4 Package Insulation Characteristics
      5. 9.3.5 Safety Limiting Values
    4. 9.4 Device Functional Modes
      1. 9.4.1 Device I/O Schematic
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 PCB Material
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Related Links
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

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10 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

10.1 Application Information

The ISO72x devices use single-ended TTL or CMOS-logic-switching technology. The supply voltage range of the devices is from 3 V to 5.5 V for both supplies, VCC1 and VCC2. When designing with digital isolators, due to the single-ended design structure, digital isolators do not conform to any specific interface standard and are only intended for isolating single-ended CMOS or TTL digital signal lines. The isolator is typically placed between the data controller (μC or UART), and a data converter or a line transceiver, regardless of the interface type or standard.

10.2 Typical Application

The ISO721 device can be used with Texas Instruments’ microcontroller, CAN transceiver, transformer driver, and low-dropout voltage regulator to create an Isolated CAN Interface as shown in Figure 18.

ISO721 ISO721M ISO722 ISO722M typical_circuit_sll629.gif
1. Multiple pins and capacitors omitted for clarity purpose.
Figure 18. Isolated CAN Interface

10.2.1 Design Requirements

Unlike optocouplers which need external components to improve performance and provide bias (or limit current), the ISO72x devices need only two external bypass capacitors to operate.

10.2.2 Detailed Design Procedure

Typical ISO721 circuit hook-up is shown in Figure 19.

ISO721 ISO721M ISO722 ISO722M basic_app_lls629.gif Figure 19. Typical ISO721 Circuit Hook-up

The ISO72x isolators have the same functional pinout as those of most other vendors as shown in Figure 20, and they are often pin-for-pin drop-in replacements. The notable differences in the products are propagation delay, signaling rate, power consumption, and transient protection rating. Table 3 is used as a guide for replacing other isolators with the ISO72x family of single channel isolators.

ISO721 ISO721M ISO722 ISO722M manf_pins_lls629.gif Figure 20. Pin Cross Reference

Table 3. Cross Reference

ISOLATOR PIN 1 PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8
ISO721
OR
ISO721M		 ISO722
OR
ISO722M
ISO721(1)(2) VCC1 IN VCC1 GND1 GND2 OUT GND2 EN VCC2
ADuM1100(1)(2) VDD1 VI VDD1 GND1 GND2 VO GND2 VDD2
HCPL-xxxx VDD1 VI *Leave Open(3) GND1 GND2 VO NC(5) VDD2
IL710 VDD1 VI NC(4) GND1 GND2 VO V OE VDD2
(1) Pin 1 should be used as VCC1. Pin 3 can also be used as VCC1 or left open, as long as pin 1 is connected to VCC1.
(2) Pin 5 should be used as GND2. Pin 7 can also be used as GND2 or left open, as long as pin 5 is connected to GND2.
(3) Pin 3 of the HCPL devices must be left open. This is not a problem when substituting an ISO72x device, because the extra VCC1 on pin 3 can be left an open circuit as well.
(4) Pin 3 of the IL710 must not be tied to ground on the circuit board because this shorts the ISO72x VCC1 to ground. The IL710 pin 3 can only be tied to VCC or left open to drop in an ISO72x device.
(5) An HCPL device pin 7 must be left floating (open) or grounded when an ISO722 or ISO722M device is to be used as a drop-in replacement. If pin 7 of the ISO722 or ISO722M device is placed in a high logic state, the output of the device is disabled.

10.2.3 Application Curves

ISO721 ISO721M ISO722 ISO722M ISO721MD_3p3V_25Mbps_zoom_slls629.png Figure 21. ISO721M Eye Diagram at 25 Mbps,
3.3 V and 25°C
ISO721 ISO721M ISO722 ISO722M ISO721MD_3p3V_150Mbps_zoom_slls629.png Figure 22. ISO721M Eye Diagram at 150 Mbps,
3.3 V and 25°C