Overview
The ISO7221BDRG4 is a dual-channel digital isolator produced by Texas Instruments. This device is part of the ISO7221x family, which provides galvanic isolation between the input and output sides, ensuring high voltage isolation and preventing noise currents from interfering with sensitive circuitry. The ISO7221BDRG4 features TI’s silicon-dioxide (SiO2) isolation barrier, offering up to 4000VPK of isolation voltage per VDE standards. This isolator is designed to work with isolated power supplies and is suitable for various applications requiring high isolation and low noise.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Supply Voltage (VCC1, VCC2) | -0.5 | 6 | V |
| Voltage at IN, OUT | -0.5 | VCC + 0.5 | V |
| Output Current (IO) | -15 | 15 | mA |
| Maximum Junction Temperature (TJ) | - | 170 | °C |
| Storage Temperature (Tstg) | -65 | 150 | °C |
| Signaling Rate Options | - | 1, 5, 25, 150 Mbps | - |
| Channel-to-Channel Output Skew | - | 1 ns Max | - |
| Pulse-Width Distortion (PWD) | - | 1 ns Max | - |
| Maximum Repetitive Peak Isolation Voltage (VIORM) | - | 560 VPK | - |
| Maximum Transient Isolation Voltage (VIOTM) | - | 4000 VPK | - |
| Withstand Isolation Voltage (VISO) | - | 2500 VRMS | - |
Key Features
- Galvanic isolation up to 4000VPK per VDE standards using TI’s silicon-dioxide (SiO2) isolation barrier.
- Dual-channel configuration with channels oriented in opposite directions for the ISO7221x family.
- Signaling rate options: 1, 5, 25, and 150 Mbps.
- Low channel-to-channel output skew and pulse-width distortion (both 1 ns Max).
- Failsafe circuitry that drives the output to a logic high state if the input is unpowered or not actively driven.
- High ESD protection: Human Body Model (HBM) ±4000 V and Charged Device Model (CDM) ±1000 V.
- Compliance with various safety standards including VDE, CSA, and UL certifications.
Applications
- Industrial control systems requiring high isolation and noise immunity.
- Medical devices where patient safety and isolation are critical.
- Automotive systems needing robust and reliable signal isolation.
- Power supplies and DC-DC converters requiring isolated feedback loops.
- Data acquisition and communication systems in noisy environments.
Q & A
- What is the maximum isolation voltage of the ISO7221BDRG4?
The maximum isolation voltage is up to 4000VPK per VDE standards.
- What are the signaling rate options for this device?
The signaling rate options are 1, 5, 25, and 150 Mbps.
- What is the maximum junction temperature for the ISO7221BDRG4?
The maximum junction temperature is 170°C.
- Does the ISO7221BDRG4 have failsafe circuitry?
- What are the ESD protection ratings for this device?
The ESD protection ratings are ±4000 V for Human Body Model (HBM) and ±1000 V for Charged Device Model (CDM).
- What safety certifications does the ISO7221BDRG4 comply with?
The device complies with VDE, CSA, and UL certifications.
- What is the purpose of the periodic update pulse in the ISO7221BDRG4?
The periodic update pulse verifies the proper dc level of the output and ensures the failsafe circuit operates correctly.
- How does the device handle channel orientation?
The channels in the ISO7221x family are oriented in opposite directions to facilitate PCB layout.
- What is the typical power dissipation of the ISO7221BDRG4?
The typical power dissipation is 390 mW under specified test conditions.
- What are the thermal resistance values for the ISO7221BDRG4?
The junction-to-ambient thermal resistance is 212°C/W for Low-K thermal resistance and 122°C/W for High-K thermal resistance.
