ISO7842DWR

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1. Describe

The ISO7842DWR device is a high performance quad-channel digital isolator with 8000-VPK isolation voltage. The device is certified for reinforced isolation by VDE, CSA, CQC and TUV. The isolator provides high electromagnetic immunity and low emissions at low power consumption while isolating CMOS or LVCMOS digital I/O. Each isolated channel has a logic input and output buffer separated by a silicon dioxide (SiO2) insulating barrier. The device has enable pins that can be used to place the respective outputs in high impedance for multi-master drive applications and reduce power consumption. The ISO7842 device has two forward and two reverse channels. If input power or signal is lost, the default output of the ISO7842 device is high, and the default output of the ISO7842F device is low. Used with isolated power supplies, this device helps prevent noise currents on the data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuitry. Through innovative chip design and layout techniques, the electromagnetic compatibility of ISO7842 devices has been significantly enhanced to simplify system-level ESD, EFT, surge and emissions compliance. The ISO7842 device is available in 16-pin SOIC wide body (DW) and extra wide body (DWW) packages.

2. Feature

    1. Signaling rate: up to 100 Mbps

    2. Wide supply range: 2.25 V to 5.5 V

    3. 2.25V to 5.5V level translation

    4. Wide temperature range: –55°C to +125°C

    5. Low power consumption, typically 1.7 mA per channel at 1 Mbps

    6. Low propagation delay: 11 ns typical (5V supply)

    7. Industry leading CMTI (min): ±100 kV/μs

    8. Strong Electromagnetic Compatibility (EMC)

    9. System level ESD, EFT and surge immunity

  10. Low emissions

  11. Barrier life: >40 years

  12. Wide-body SOIC-16 package and ultra-wide-body SOIC-16 package options

  13. Safety and Regulatory Approvals:

        – 8000-VPK Reinforced isolation according to DIN V VDE V 0884-10 (VDE V 0884-10):2006-12

        – 5.7kVRMS isolation for 1 minute per UL 1577

        – CSA Component Acceptance Notice 5A, IEC 60950-1 and IEC 60601-1 End Equipment Standards

        – CQC certification conforms to GB4943.1-2011

        – TUV certification according to EN 61010-1 and EN 60950-1

        – All DW packages certified; DWW package certified according to UL, VDE, TUV and planned for CSA and CQC

3. Application

    1. automated industry

    2. motor control

    3. power supply

    4. Solar inverters

    5. medical equipment

    6. Hybrid Electric Vehicles

4. Pin configuration

5. Pin Description

6. Function description

    1. Robust ESD protection unit for input and output signal pins and inter-die pads.

    2. Low resistance connection of ESD unit to power and ground pins.

    3. Enhanced performance of high voltage isolation capacitors to better withstand ESD, EFT and surge events.

    4. Larger on-chip decoupling capacitors bypass unwanted high-energy signals with low impedance small road.

    5. PMOS and NMOS devices are isolated from each other using guard rings to avoid trigger parasitics SCR.

    6. Reduces common-mode currents across isolation barriers by ensuring purely differential internal operation

7. Application Information

The ISO7842 device is a high-performance, quad-channel digital isolator with 5.7kVRMS each isolation UL 1577. Each side of the device has an enable pin that can be used to bring the respective output high Impedance and reduced power consumption for multi-master drive applications. ISO7842 equipment usage Single-ended CMOS logic switching technology. Both have a supply voltage range of 2.25 V to 5.5 V Power, VCC1 and VCC2. When designing with digital isolators, keep in mind that due to the single-ended By design, digital isolators do not conform to any specific interface standard and are only used for Isolated single-ended CMOS or TTL digital signal lines. Isolators are usually placed between the data controller (i.e. µC or UART), and data converters or line transceivers, regardless of interface type or standard.