ISO7421FEDR Isolators

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1. Describe

The ISO7421FEDR provides up to 2500 VRMS of galvanic isolation for 1 minute per UL and 4242 VPK per VDE. These devices have two isolated channels. Each channel has a logic input and output buffer separated by a silicon dioxide (SiO2) insulating barrier. Used in conjunction with isolated power supplies, these devices prevent noise currents or other circuits on the data bus from entering the local ground and interfering with or damaging sensitive circuits. ISO7420 has two channels in the same direction, while ISO7421 has two channels in opposite directions. In case of input power or loss of signal, the default output is "low" with the suffix "F" and "high" with the device suffix "F". The ISO742x has no integrated noise filter and therefore has fast propagation delays. These devices have TTL input thresholds and operate from a 3V to 5.5V supply. All inputs are 5V fault tolerant when powered from a 3.3V supply.

2. Feature

    1. Signaling rate > 50 Mbps

    2. Default output High and Low options

    3. Low power consumption: Typical ICC per channel (3.3V supply):

        – ISO7420: 1.4 mA at 1 Mbps, 2.5 mA at 25 Mbps

        – ISO7421: 1.8 mA at 1 Mbps, 2.8 mA at 25 Mbps

    4. Low propagation delay: 7 ns typical

    5. Low pulse skew: 200 ps typical

    6. Specified wide TA range: –40°C to 125°C

    7. 50KV/μs transient immunity, typical

    8. Barrier life: > 25 years

    9. Operates from 3V to 5.5V supply voltage

  10. 3.3V and 5V level shifting

  11. Narrow body SOIC-8 package

  12. Safety and Regulatory Approvals:

        – 4242 VPK isolation according to DIN V VDE V 0884-10 and DIN EN 61010-1

        – 2500 VRMS isolation for 1 minute per UL 1577

        – CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 61010-1 Standards

        – CQC certification according to GB4943.1-2011

3. Application

    1. Optocoupler replacement:

        – Industrial Fieldbus

           – ProfiBus

           – ModBus

           – DeviceNet™ data bus

        – Servo control interface

        – motor control

        – power supply

        – Battery

4. Pin configuration

5. Pin Description

6. Application Information

The ISO7421FEDR uses single-ended TTL logic switching technology. Its supply voltage range is 3 V to 5.5 V with two supplies, VCC1 and VCC2. When designing with digital isolators, it is important to remember that due to the single-ended design structure, digital isolators do not conform to any specific interface standard and are only used to isolate single-ended CMOS or TTL digital signal lines. Isolators are typically placed on data controllers (i.e. µC or UART), as well as data converters or line transceivers, regardless of interface type or standard.