Overview
The ISO721DRG4 is a high-speed digital isolator produced by Texas Instruments. This device is part of the ISO721 series, which includes the ISO721, ISO721M, ISO722, and ISO722M. The ISO721DRG4 is designed to provide galvanic isolation between the input and output logic signals, ensuring that noise currents on a data bus or other circuits do not interfere with or damage sensitive circuitry. It operates using a silicon dioxide (SiO2) insulation barrier, offering up to 4000 VPK of isolation voltage per VDE 0884-17 standards.
The device supports signaling rates of up to 100 Mbps and features low propagation delay and pulse skew, making it suitable for high-speed applications. It also includes a failsafe output and can operate from both 3.3V and 5V supplies, with an operating temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Signaling Rate | - | - | 100 Mbps | - | bps |
| Propagation Delay | - | - | 12 ns | - | ns |
| Pulse Skew | - | - | 0.5 ns | - | ns |
| Supply Voltage (VCC1, VCC2) | - | -0.5 | - | 6 | V |
| Input Voltage (IN, OUT, or EN) | - | -0.5 | - | VCC + 0.5 | V |
| Output Current (IO) | - | -15 | - | 15 | mA |
| Maximum Junction Temperature (TJ) | - | - | - | 170 | °C |
| Storage Temperature (Tstg) | - | -65 | - | 150 | °C |
| Isolation Voltage (VIOTM) | - | - | - | 4000 VPK | VPK |
| Common-Mode Transient Immunity (CMTI) | - | - | 25 | 50 | kV/μs |
Key Features
- High-Speed Signaling: Supports signaling rates up to 100 Mbps.
- Low Propagation Delay and Pulse Skew: Typical propagation delay of 12 ns and pulse skew of 0.5 ns.
- Low-Power Sleep Mode: The ISO722 and ISO722M devices include an active-low output enable for power conservation.
- Failsafe Output: The output defaults to a logic-high state if the input is unpowered or not actively driven.
- Drop-In Replacement: Compatible with most opto and magnetic isolators.
- Dual Supply Voltages: Operates from both 3.3V and 5V supplies.
- Wide Operating Temperature Range: –40°C to +125°C.
- High Electromagnetic Immunity: Common-mode transient immunity of up to 50 kV/μs.
- Safety and Regulatory Approvals: Compliant with DIN EN IEC 60747-17, UL 1577, IEC 61010-1, and IEC 62368-1.
Applications
- Factory Automation: Suitable for Modbus, Profibus™, and DeviceNet™ data buses.
- Computer Peripheral Interface: Ideal for interfacing with computer peripherals.
- Servo Control Interface: Used in servo control systems.
- Data Acquisition: Employed in data acquisition systems.
- Industrial Fieldbus and Smart Distributed Systems (SDS™): Compatible with various industrial communication protocols.
Q & A
- What is the maximum signaling rate of the ISO721DRG4?
The ISO721DRG4 supports signaling rates up to 100 Mbps.
- What is the typical propagation delay of the ISO721DRG4?
The typical propagation delay is 12 ns.
- Does the ISO721DRG4 have a failsafe output feature?
- What are the supported supply voltages for the ISO721DRG4?
- What is the operating temperature range of the ISO721DRG4?
- Is the ISO721DRG4 compliant with any safety and regulatory standards?
- Can the ISO721DRG4 be used as a drop-in replacement for other isolators?
- What is the common-mode transient immunity of the ISO721DRG4?
- Does the ISO721DRG4 have any power-saving features?
- What are some typical applications of the ISO721DRG4?
