Overview
The ISO7521CDWR, produced by Texas Instruments, is a high-performance, dual-channel digital isolator designed to provide reliable and safe signal isolation in various applications. This device operates from 3.3-V or 5-V supply and logic levels, making it versatile for different system requirements. The ISO7521CDWR features a silicon oxide (SiO2) insulation barrier, ensuring robust isolation between the input and output channels. This isolator is particularly useful in preventing noise currents and protecting sensitive circuitry from interference.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage (VCC1, VCC2) | 3.15 | 5.25 | V | ||
| Isolation Voltage | 6000 | VPK | |||
| Isolation Voltage (VRMS) | 4243 | VRMS | |||
| Propagation Delay Time (tPLH, tPHL) | VCC1 and VCC2 at 5 V ± 5% | 9 | 14 | ns | |
| Output Signal Rise Time (tr) | VCC1 and VCC2 at 5 V ± 5% | 1 | ns | ||
| Output Signal Fall Time (tf) | VCC1 and VCC2 at 5 V ± 5% | 1 | ns | ||
| Supply Current (ICC1, ICC2) at 1 Mbps | VCC1 and VCC2 at 5 V ± 5% | 0.4 | 1 | 6 | mA |
| Common-mode Transient Immunity (CMTI) | 25 | 40 | kV/µs |
Key Features
- Dual-channel digital isolator: Provides two isolated channels for signal transmission.
- 3.3-V and 5.0-V level translation: Supports operation from both 3.3-V and 5-V supply and logic levels.
- High isolation voltage: Offers 6000 VPK and 4243 VRMS isolation voltage, ensuring robust electrical isolation.
- Common-mode transient immunity (CMTI): Up to 40 kV/µs, enhancing noise immunity.
- TTL input thresholds: Compatible with TTL logic levels.
- Fail-safe output: Ensures output remains in a known state during power loss.
- Compliance with safety standards: Meets various safety and regulatory approvals including DIN V VDE V 0884-10, UL 1577, CSA, IEC 60950-1, IEC 61010-1, and IEC 60601-1.
Applications
The ISO7521CDWR is suitable for a variety of applications requiring reliable signal isolation, including:
- Industrial control systems: Isolating signals between control units and field devices.
- Medical devices: Ensuring patient safety by isolating signals in medical equipment.
- Automotive systems: Isolating signals in automotive control units and sensors.
- Isolated 4-20 mA current loops: Used in conjunction with microcontrollers, digital-to-analog converters, transformer drivers, and voltage regulators to create isolated current loops.
Q & A
- What is the operating supply voltage range for the ISO7521CDWR?
The ISO7521CDWR operates from a supply voltage range of 3.15 V to 5.25 V for both VCC1 and VCC2.
- What is the isolation voltage of the ISO7521CDWR?
The device offers an isolation voltage of 6000 VPK and 4243 VRMS.
- What are the typical propagation delay times for the ISO7521CDWR?
The propagation delay times (tPLH, tPHL) are typically around 14 ns when VCC1 and VCC2 are at 5 V ± 5%.
- Does the ISO7521CDWR support TTL logic levels?
Yes, the device has TTL input thresholds and can operate with TTL logic levels.
- What is the common-mode transient immunity (CMTI) of the ISO7521CDWR?
The CMTI is up to 40 kV/µs.
- Is the ISO7521CDWR compliant with safety standards?
Yes, it meets various safety and regulatory approvals including DIN V VDE V 0884-10, UL 1577, CSA, IEC 60950-1, IEC 61010-1, and IEC 60601-1.
- What are some typical applications of the ISO7521CDWR?
Typical applications include industrial control systems, medical devices, automotive systems, and isolated 4-20 mA current loops.
- How does the ISO7521CDWR handle power loss?
The device features a fail-safe output that ensures the output remains in a known state during power loss.
- What is the maximum case temperature for the ISO7521CDWR?
The maximum case temperature is 150°C.
- What is the typical supply current for the ISO7521CDWR at 1 Mbps?
The typical supply current (ICC1, ICC2) at 1 Mbps is between 0.4 mA and 6 mA depending on the configuration.
