SLLS918D July   2008  – November 2024 ISO721-Q1 , ISO722-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  Recommended Operating Conditions
    3. 6.3  Thermal Information
    4. 6.4  Power Ratings
    5. 6.5  Insulation Specifications
    6. 6.6  Safety-Related Certifications
    7. 6.7  Safety Limiting Values
    8. 6.8  Electrical Characteristics: VCC1 and VCC2 5-V Operation
    9. 6.9  Electrical Characteristics: VCC1 and VCC2 at 3.3-V Operation
    10. 6.10 Electrical Characteristics: VCC1 at 3.3-V, VCC2 at 5-V Operation
    11. 6.11 Electrical Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    12. 6.12 Switching Characteristics: VCC1 and VCC2 5-V Operation
    13. 6.13 Switching Characteristics: VCC1 and VCC2 at 3.3-V Operation
    14. 6.14 Switching Characteristics: VCC1 at 3.3-V, VCC2 at 5-V Operation
    15. 6.15 Switching Characteristics: VCC1 at 5-V, VCC2 at 3.3-V Operation
    16. 6.16 Typical Characteristics
    17. 6.17 Insulation Characteristics Curves
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Device Functional Modes
      1. 8.3.1 Device I/O Schematic
  10. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
    3. 9.3 Power Supply Recommendations
    4. 9.4 Layout
      1. 9.4.1 Layout Guidelines
        1. 9.4.1.1 PCB Material
      2. 9.4.2 Layout Example
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Support Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  12. 11Revision History
  13. 12Mechanical, Packaging, and Orderable Information

9.2.2 Detailed Design Procedure

Figure 9-2 shows a typical circuit hook-up for the ISO721-Q1 device.

ISO721-Q1 ISO722-Q1 Typical ISO721-Q1 Circuit Hook-up Figure 9-2 Typical ISO721-Q1 Circuit Hook-up

The ISO72x-Q1 isolators have the same functional pinout as those of most other vendors as shown in Figure 9-3, and 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 9-1 is used as a guide for replacing other isolators with the ISO72x-Q1 family of single-channel isolators.

ISO721-Q1 ISO722-Q1 Pin Cross Reference Figure 9-3 Pin Cross Reference
Table 9-1 Cross Reference
ISOLATORPIN 1PIN 2PIN 3PIN 4PIN 5PIN 6PIN 7PIN 8
ISO721-Q1
OR
ISO721M-Q1		ISO722-Q1
OR
ISO722M-Q1
ISO721(1)(2)VCC1INVCC1GND1GND2OUTGND2ENVCC2
ADuM1100(1)(2)VDD1VIVDD1GND1GND2VOGND2VDD2
HCPL-xxxxVDD1VI*Leave Open(3)GND1GND2VONC(5)VDD2
IL710VDD1VINC(4)GND1GND2VOV OEVDD2
(1) Pin 1 must 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 must 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-Q1 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-Q1 VCC1 to ground. The IL710 pin 3 can only be tied to VCC or left open to drop in an ISO72x-Q1 device.
(5) An HCPL device pin 7 must be left floating (open) or grounded when an ISO722-Q1 or ISO722M-Q1 device is to be used as a drop-in replacement. If pin 7 of the ISO722-Q1 or ISO722M-Q1 device is placed in a high logic state, the output of the device is disabled.