Overview
The ISO7221CDR is a dual-channel digital isolator produced by Texas Instruments. This device is part of the ISO7221x family, which is designed to provide galvanic isolation between logic input and output buffers. The channels in the ISO7221x series are oriented in opposite directions, facilitating flexible PCB layout designs. The isolators use Texas Instruments' silicon-dioxide (SiO2) isolation barrier, ensuring up to 4000 VPK of isolation per VDE standards. This isolation is crucial for blocking high voltages, isolating grounds, and preventing noise currents from interfering with sensitive circuitry.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Signaling Rate Options | 1, 5, 25, and 150 Mbps | - |
| Channel-to-Channel Output Skew | 1 ns Max | - |
| Pulse-Width Distortion (PWD) | 1 ns Max | - |
| Jitter Content | 1 ns Typ at 150 Mbps | - |
| Transient Immunity | 50 kV/μs Typ | - |
| Supply Voltages | 2.8 V, 3.3 V, 5 V | - |
| ESD Protection | 4 kV | - |
| Maximum Repetitive Peak Isolation Voltage | 4000 VPK | - |
Key Features
- 1, 5, 25, and 150 Mbps signaling rate options
- Low channel-to-channel output skew; 1 ns Max
- Low pulse-width distortion (PWD); 1 ns Max
- Low jitter content; 1 ns Typ at 150 Mbps
- 50 kV/μs typical transient immunity
- Operates with 2.8 V (C-Grade), 3.3 V, or 5 V supplies
- 4 kV ESD protection
- High electromagnetic immunity
- –40°C to +125°C operating range
- Typical 28-year life at rated voltage
- Safety-related certifications: DIN EN IEC 60747-17 (VDE 0884-17), UL 1577 component recognition program, IEC 61010-1, IEC 62368-1
Applications
The ISO7221CDR is suitable for various applications requiring high isolation and low noise interference. These include:
- Industrial control systems where isolation between high-voltage and low-voltage circuits is necessary.
- Medical devices that require strict isolation to ensure patient safety.
- Automotive systems where noise immunity and high voltage isolation are critical.
- Data acquisition systems that need to isolate sensitive analog signals from noisy digital circuits.
- Power supplies and DC-DC converters where isolation is required to prevent ground loops and noise propagation.
Q & A
- What is the primary function of the ISO7221CDR?
The ISO7221CDR is a dual-channel digital isolator that provides galvanic isolation between logic input and output buffers, ensuring high voltage isolation and noise immunity.
- What are the signaling rate options for the ISO7221CDR?
The ISO7221CDR supports signaling rates of 1, 5, 25, and 150 Mbps.
- What is the maximum operating temperature range for the ISO7221CDR?
The device operates over a temperature range of –40°C to +125°C.
- What are the supply voltage options for the ISO7221CDR?
The device can operate with supply voltages of 2.8 V, 3.3 V, or 5 V.
- What is the maximum repetitive peak isolation voltage for the ISO7221CDR?
The device provides up to 4000 VPK of isolation voltage.
- Does the ISO7221CDR have ESD protection?
Yes, the device has 4 kV ESD protection.
- What safety certifications does the ISO7221CDR hold?
The device is certified under DIN EN IEC 60747-17 (VDE 0884-17), UL 1577 component recognition program, IEC 61010-1, and IEC 62368-1.
- How does the ISO7221CDR handle transient pulses?
The device includes a noise filter at the input to prevent transient pulses from being passed to the output.
- What is the typical life expectancy of the ISO7221CDR at rated voltage?
The device has a typical life expectancy of 28 years at rated voltage.
- Can the ISO7221CDR be used in high-noise environments?
Yes, the device is designed with high electromagnetic immunity and transient immunity, making it suitable for high-noise environments.
