Overview
The ISO721DR is a single-channel, 100-Mbps digital isolator produced by Texas Instruments. This device 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. The ISO721DR features a silicon dioxide (SiO2) insulation barrier that provides up to 4000VPK of isolation per VDE 0884-17. It operates over a wide temperature range of –40°C to +125°C and is compatible with both 3.3V and 5V supply voltages.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | –40 to 125 | °C |
| Signaling Rate | 100 and 150 Mbps | - |
| Propagation Delay | 12 ns (typical) | ns |
| Pulse Skew | 0.5 ns (typical) | ns |
| Supply Voltages | 3.3V, 5V, or any combination | V |
| Input Tolerance | 5V tolerant when supplied from 3.3V | - |
| Output Current | 4 mA CMOS | mA |
| Isolation Voltage | 4000 VPK | VPK |
| Safety Certifications | DIN EN IEC 60747-17, UL 1577, IEC 61010-1, IEC 62368-1 | - |
Key Features
- 100 and 150 Mbps signaling rate options
- Low-power sleep mode
- Typical 28-year life at rated working voltage
- High electromagnetic immunity
- Failsafe output
- Drop-in replacement for most opto and magnetic isolators
- TTL input thresholds and noise filter at the input to prevent transient pulses
- CMOS VCC / 2 input thresholds for ISO721M devices with reduced-jitter operation
- Active-low output enable for ISO722 and ISO722M devices to conserve power
Applications
- Factory Automation: Modbus, Profibus™, DeviceNet™ Data Buses
- Computer Peripheral Interface
- Servo Control Interface
- Data Acquisition
Q & A
- What is the primary function of the ISO721DR?
The ISO721DR is a digital isolator that provides galvanic isolation between the input and output logic signals, preventing noise currents from interfering with sensitive circuitry.
- What are the signaling rate options for the ISO721DR?
The ISO721DR supports signaling rates of 100 and 150 Mbps.
- What is the typical propagation delay of the ISO721DR?
The typical propagation delay is 12 ns.
- What is the operating temperature range of the ISO721DR?
The device operates over a temperature range of –40°C to +125°C.
- What supply voltages does the ISO721DR support?
The ISO721DR supports supply voltages of 3.3V, 5V, or any combination thereof.
- Does the ISO721DR have any safety certifications?
- What is the isolation voltage rating of the ISO721DR?
The isolation voltage rating is up to 4000 VPK.
- Does the ISO721DR have a failsafe output feature?
- Can the ISO721DR be used as a drop-in replacement for other isolators?
- What are some common applications of the ISO721DR?
