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The ISO7221CDR device is a dual-channel digital isolator. For ease of PCB layout, the channels in the ISO7221CDR are oriented in opposite directions. These devices feature logic input and output buffers, which are isolated by TI's silicon dioxide (SiO₂) isolation gate, providing electrical isolation compliant with VDE standards and up to 4000Vpk. When used with an isolated power supply, these devices prevent high voltages and isolated grounding, and prevent noise currents on the data bus or other circuits from entering the local ground or causing interference or damage to sensitive circuits.

Binary input signals are conditioned and converted into balanced signals, which are then differential-amplified by the isolation layer. Across this isolation layer, differential comparators receive logic conversion information and accordingly set or reset the trigger and output circuits. The circuit sends periodic update pulses across the isolation layer to verify that the DC output level is normal. If this DC refresh pulse is not received every 4µs, the input is considered unpowered or not actively driven, and the fail-safe circuit drives the output to a logic high state.

The time constant provides fast operation, with a signal transmission rate range of 0Mbps (DC) to 150Mbps (the signal transmission rate on the line is the number of voltage conversions per second, expressed in bps). Option A, Option B, and Option C devices have TTL input thresholds and include input noise filters to prevent transient pulses from being transmitted to the device's output. Option M devices have CMOS VCC/2 input thresholds, no input noise filters, and no additional propagation delay.

ISO7221CDR devices require two 2.8V (Class C), 3.3V, 5V power supplies or any combination of these power supplies. When powered by 2.8V or 3.3V power supplies, all inputs can withstand 5V voltage, and all outputs are 4mA CMOS.

The ISO7221CDR device operates over an ambient temperature range of –40°C to +125°C.

ISO7221CDR Features

1Mbps, 5Mbps, 25Mbps, and 150Mbps signaling rate options

Low channel output skew; maximum of 1ns

Low pulse width distortion (PWD); maximum of 1ns

Low jitter content; typical value of 1 ns at 150 Mbps  

50 kV/µs typical transient immunity  

Powered by 2.8 V (Class C), 3.3 V, or 5 V supplies  

4 kV ESD protection  

High electromagnetic immunity

Operating temperature range: –40°C to +125°C

Applications for ISO7221CDR

• Factory automation

– Modbus

– Profibus™

– DeviceNet™ data bus

• Computer peripheral interfaces

• Server control interface

• Data acquisition

• 1.Is the inventory and price seen on the platform accurate?

  A: all online goods on the shelves can be ordered online, but considering the large liquidity of spot inventory, it is not possible to achieve 100% accuracy at present. In case of any abnormality, you can contact our company online and give the corresponding solution.

• 2.Are all our products genuine?

  A: our self-supporting products are from cooperative domestic and foreign original factories or authorized agents, and the source can be traced to ensure the original and authentic products.

• 3.Can you provide the qualification certificate of the original factory or agent?

  A: at present, our self-employed brands TI，ST，ADI，NXP，LATTICE，CYPRESS，INFINEON，XILINX and other first-line brands. Other channels are the original factory and agency channels. If necessary, we can communicate and confirm according to the specific brand and model.

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• 5.When can I deliver the goods after placing an order? How long will it take to get there?

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• 6.Can the company issue an invoice?

  A: you can issue ordinary invoices for individual users or special VAT invoices for enterprise users.