SLLA284F July   2022  – July 2022 ISO5451 , ISO5452 , ISO5851 , ISO5852S , ISO7142CC , ISO7142CC-Q1 , ISO721 , ISO721-Q1 , ISO721M , ISO721M-EP , ISO722 , ISO7220A , ISO7220M , ISO7221A , ISO7221B , ISO7221C , ISO7221M , ISO722M , ISO7230A , ISO7230C , ISO7230M , ISO7231A , ISO7231C , ISO7231M , ISO7240A , ISO7240C , ISO7240CF , ISO7240M , ISO7241A , ISO7241C , ISO7241M , ISO7242A , ISO7242C , ISO7242M , ISO7310-Q1 , ISO7310C , ISO7340-Q1 , ISO7340C , ISO7340FC , ISO7341-Q1 , ISO7341C , ISO7341FC , ISO7342-Q1 , ISO7342C , ISO7342FC , ISO7740 , ISO7741 , ISO7742 , ISO7760 , ISO7761 , ISO7762 , ISO7810 , ISO7820 , ISO7821 , ISO7830 , ISO7831 , ISO7840 , ISO7841 , ISO7842

 

  1.   Digital Isolator Design Guide
  2.   Trademarks
  3. 1Operating Principle
    1. 1.1 Edge-Based Communication
    2. 1.2 On-Off Keying (OOK) Based Communication
  4. 2Typical Applications for Digital Isolators and Isolated Functions
  5. 3Digital Isolator Selection Guide
    1. 3.1 Parameters of Interest
    2. 3.2 Isolator Families
  6. 4PCB Design Guidelines
    1. 4.1 PCB Material
    2. 4.2 Layer Stack
    3. 4.3 Creepage Distance
    4. 4.4 Controlled Impedance Transmission Lines
    5. 4.5 Reference Planes
    6. 4.6 Routing
    7. 4.7 Vias
    8. 4.8 Decoupling Capacitors
  7. 5Summary
  8. 6References
  9. 7Revision History

Isolator Families

Table 3-1 briefly describes the key features of a few digital isolator families and isolated functions from TI. For a more exhaustive listing of devices please visit:
http://www.ti.com/lsds/ti/analog/isolators/overview.page

Table 3-1 Digital Isolator Families and Isolated Functions
Isolator TypeDeviceIsolation PerformanceTiming PerformanceCMTIPackagePower per Channel
(5 typ, 1Mbps)

Digital Isolator

ISO67xx

VIOTM = 7071 Vpk
VIORM = 2121 Vpk
Surge = 10 kV
Data rate = 50Mbps
Prop delay = 11 ns typ
Skew = 6ns max
Glitch filter not required

150

kV/µs typ
100 kV/µs min
CTI > 600
16-SOIC, CTI > 400 8-SOIC

1.8 mA

Digital IsolatorISO78xxVIOTM = 8000 Vpk
VIORM = 2121 Vpk
Surge = 12.8 kV
Data rate = 100Mbps
Prop delay = 11 ns typ
Skew = 2.5 ns max
Glitch filter not required
100 kV/µs minCTI > 600
16-SOIC
1.7 mA
Digital IsolatorISO77xxVIOTM = 8000 Vpk
VIORM = 2121 Vpk
Surge = 12.8 kV
Data rate = 100Mbps
Prop delay = 10.7 ns typ
Skew = 4.1 ns max
Glitch filter not required
100 kV/µs typ
85 kV/µs min
CTI > 600
16-SOIC, 8-SOIC,
16-SSOP
1.4 mA

Digital Isolator

ISO70xx

VIOTM = 4000 Vpk
VIORM = 566 Vpk
Surge = 6.4 kV
Data rate = 4Mbps
Prop delay = 140 ns typ
Skew = 10ns max
Glitch filter not required
100 kV/µs typ
50 kV/µs min
CTI > 600
8-SOIC,
16-SSOP

0.116 mA

Digital IsolatorISO73xxVIOTM = 4242 Vpk
VIORM = 1414 Vpk
Surge = 6 kV
Data rate = 25Mbps
Prop delay = 35 ns typ
Skew = 3 ns max
Integrated glitch filter
50 kV/µs typ
25 kV/µs min
400 < CTI < 600
8-SOIC,
16-SOIC
1.1 mA (5 V)
0.85 mA (3.3 V)
Digital IsolatorISO71xxVIOTM = 4242 Vpk
VIORM = 566 Vpk
Surge = 4 kV
Data rate = 50Mbps
Prop delay = 21 ns typ
Skew = 2 ns max
Integrated glitch filter
50 kV/µs typ
25 kV/µs min
400 < CTI < 600
16-QSOP
1.65 mA (5 V)
1.3 mA (3.3 V)
Isolated CANISO1042
ISO1044
VIOTM = 7071, 4242 Vpk
VIORM = 1500, 637 Vpk
Surge = 8, 10 kV
Loop delay = 150 ns typ100 kV/µs typ
85 kV/µs min
CTI > 600
16-SOIC, 8-SOIC
State dependent
Isolated RS-485ISO14xx
ISO1500
VIOTM = 7071, 4242 Vpk
VIORM = 1500, 566 Vpk
Surge = 10 kV
Prop delay = 19 to 310 ns100 kV/µs typ
85 kV/µs min
CTI > 600
16-SOIC, 8-SOIC
State dependent
Isolated I2CISO16xxVIOTM = 7071, 4242 Vpk
VIORM = 2121, 637 Vpk
Surge = 10, 6.5 kV
Clock freq max = 1.7 Mbps, GPIO data rate = 50 Mbps
Loop delay = 84 ns typ
100 kV/µs typ
50 kV/µs min
CTI > 600
16-SOIC, CTI > 400 8-SOIC
State dependent

Isolated Digital Input

ISO121x

VIOTM = 3600 Vpk
VIORM = 566 Vpk
Surge = 5.2 kV
Prop delay = 110 ns70 kV/µs typ
25 kV/µs min
CTI > 600
8-SOIC,
16-SSOP

Current limit dependent

Digital Isolator with Power

ISOW77xx

VIOTM = 7071 Vpk
VIORM = 1500 Vpk
Surge = 10kV
Prop delay = 11 ns100 kV/µs typ
85 kV/µs min
CTI > 600
16-SOIC

5 mA

Digital Isolator with Power and CAN

ISOW1044

VIOTM = 7071 Vpk
VIORM = 1500 Vpk
Surge = 10kV
Loop delay = 150 ns typ100 kV/µs typ
85 kV/µs min
CTI > 600
20-DFM
State dependent
Digital Isolator with Power and

RS-485

ISOW14xx

VIOTM = 7071 Vpk
VIORM = 1500 Vpk
Surge = 10kV
Prop delay = 49 to 450 ns100 kV/µs typ
85 kV/µs min
CTI > 600
20-DFM
State dependent