ISO7231ADW

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1. Describe

The ISO7230A and ISO7231ADW are three-channel digital isolators, each with multi-channel configuration and output enable. Used with isolated power supplies, these devices block high voltages, isolate grounds, and prevent noise currents on the data bus or other circuits from entering the local ground and interfering with or damaging sensitive circuits. The ISO7230 triple channel device has all three channels in the same direction, while the ISO7231ADW has two channels in one direction and one channel in the opposite direction. These devices feature an active-high output enable that, when driven low, places the output in a high-impedance state. The ISO7230A and ISO7231ADW have TTL input thresholds and noise filters at the input to prevent transient pulses up to 2ns in duration from passing to the output of the device. In each device, periodic update pulses are sent across the isolation barrier to ensure the correct DC level of the output. If this DC refresh pulse is not received, the fail-safe circuit drives the output to a logic high state, assuming the input is not powered or actively driven. These devices require two supply voltages of 3.3V, 5V, or any combination. When powered from a 3.3V supply, all inputs are 5V tolerant and all outputs are 4mA CMOS. These devices are characterized for operation over an ambient temperature range of –40°C to 125°C.

2. Feature

    1. 1Mbps signaling rate

        – Low channel-to-channel output skew; 2ns max (5V operation)

        – Low Pulse Width Distortion (PWD); 10ns max (5V operation)

    2. Typical service life of 25 years at rated operating voltage

    3. 4000Vpeak isolation, 560Vpeak VIORM

        – UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2), IE 61010-1 and CSA certified, IEC 60950-1

    4. 4kV ESD protection

    5. Operates from a 3.3V or 5V supply

    6. High electromagnetic immunity

    7. –40°C to 125°C operating range

3. Application

    1. Industrial Fieldbus

    2. Computer peripheral interface

    3. Servo control interface

    4. data collection

4. Pin configuration