ISO72x & ISO72xx Digital Isolators


Single and Dual High-Speed Digital Isolators - Now Available at Digi-Key

Texas Instruments' 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 400V.

The ISO7220 and ISO7221 are dual-channel digital isolators. To facilitate PCB layout, the channels are oriented in the same direction in the ISO7220 and in opposite directions in the ISO7221. These devices have a logic input and output buffer that is separated by TI’s silicon dioxide (SiO2) isolation barrier, which provides galvanic isolation of up to 4000V. Tri-channel and quad-channel digital isolators are also available.
Texas Instruments Digital Isolators
  • Overview
  • Features
  • Buy Now


Overview

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, and 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.



Features:
ISO721, ISO721M, ISO722, and ISO722M

  • 4000Vpeak isolation, 560 Vpeak VIORM
    • UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2), IEC 61010-1, IEC 60950-1 and CSA approved
    • 50 kV/µs typical transient immunity
  • Signaling rate 0Mbps to 150Mbps
    • Low propagation delay
    • Low pulse skew (pulse-width distortion)
  • Low-power sleep mode
  • High electromagnetic immunity
  • Low input-current requirement
  • Failsafe output
  • Drop-in replacement for most opto and
    magnetic isolators

Features:
ISO7220 and ISO7221

  • 4000Vpeak isolation, 560 Vpeak VIORM
    • UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2), IEC 61010-1, IEC 60950-1 and CSA approved
    • 50 kV/µs typical transient immunity
  • 1, 5, 25, and 150Mbps signaling rate options
    • Low channel-to-channel output skew; 1ns max
    • Low pulse-width distortion (PWD); 1ns max
    • Low jitter content; 1ns typ at 150Mbps
  • Typical 25-year life at rated voltage
  • Operates with 3.3V or 5V supplies
  • 4 kV ESD protection
  • High electromagnetic immunity
  • -40°C to 125°C operating range


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 Available in Tape & Reel (-2-ND), Cut Tape (-1-ND), and custom Digi-Reel® (-6-ND)
Texas Instruments
Part Number
Digi-Key
Part Number
# of
Channels
Propagation
Delay
Data
Rate
Config-
uration
Output Type
Voltage - Supply
 
  ISO721MMDREP
1
16ns
150Mbs
1/0
Digital
3.3V, 5V
ISO721 Datasheet
  ISO722DR
1
24ns
100Mbs
1/0
Digital
4.5V ~ 5.5V
ISO722 Datasheet
  ISO7220ADR
2
475ns
1Mbs
2/0
CMOS
3.3V, 5V
ISO7220 Datasheet
  ISO7221CDR
2
42ns
25Mbs
1/1
CMOS
3.3V, 5V
ISO7221 Datasheet