Overview
The ISO7221MDR is a dual-channel digital isolator produced by Texas Instruments. It is part of the ISO7221x family, which provides galvanic isolation between the input and output channels. This device is designed to block high voltage and isolate grounds, preventing noise currents from interfering with or damaging sensitive circuitry. The ISO7221MDR uses Texas Instruments' silicon-dioxide (SiO2) isolation barrier to achieve up to 4000VPK of isolation per VDE 0884-17. It operates with supply voltages of 2.8V, 3.3V, or 5V and is characterized for operation over an ambient temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Signaling Rate | - | 1, 5, 25, 150 | - | Mbps |
| Channel-to-Channel Output Skew | - | 1 | 1 | ns |
| Pulse-Width Distortion (PWD) | - | 1 | 1 | ns |
| Jitter Content at 150Mbps | - | 1 | - | ns |
| Transient Immunity | - | 50 | - | kV/μs |
| Supply Voltage | 2.8 | - | 5.5 | V |
| Operating Temperature Range | -40 | - | 125 | °C |
| ESD Protection | - | - | ±4000 | V (HBM) |
| Isolation Voltage | - | - | 4000 | VPK |
Key Features
- Signaling rates of 1, 5, 25, and 150 Mbps
- Low channel-to-channel output skew and pulse-width distortion (1ns max)
- Low jitter content (1ns typ at 150Mbps)
- High transient immunity (50kV/μs typical)
- Operates with 2.8V, 3.3V, or 5V supplies
- 4kV ESD protection
- High electromagnetic immunity
- Operating temperature range of –40°C to +125°C
- TTL and CMOS input thresholds available
- Input noise filter to prevent transient pulses (TTL versions)
- Failsafe circuitry to drive output to a logic-high state if input is unpowered or not actively driven
Applications
- Factory Automation: Modbus, Profibus™, DeviceNet™ data buses
- Computer Peripheral Interface
- Servo Control Interface
- Data Acquisition
Q & A
- What is the maximum signaling rate of the ISO7221MDR?
The ISO7221MDR supports signaling rates up to 150 Mbps.
- What are the available supply voltages for the ISO7221MDR?
The device operates with supply voltages of 2.8V, 3.3V, or 5V.
- What is the isolation voltage of the ISO7221MDR?
The device provides up to 4000VPK of isolation per VDE 0884-17.
- What is the operating temperature range of the ISO7221MDR?
The device operates over an ambient temperature range of –40°C to +125°C.
- Does the ISO7221MDR have ESD protection?
Yes, the device has ±4000V ESD protection according to the Human Body Model (HBM).
- What are some common applications of the ISO7221MDR?
Common applications include factory automation, computer peripheral interfaces, servo control interfaces, and data acquisition.
- Does the ISO7221MDR have failsafe circuitry?
Yes, the device has failsafe circuitry that drives the output to a logic-high state if the input is unpowered or not actively driven.
- What types of input thresholds are available for the ISO7221MDR?
The device is available with TTL and CMOS input thresholds.
- Does the ISO7221MDR have input noise filtering?
Yes, the TTL versions of the device include an input noise filter to prevent transient pulses.
- What safety certifications does the ISO7221MDR have?
The device has certifications such as DIN EN IEC 60747-17 (VDE 0884-17), UL 1577, and IEC 62368-1, among others.
