Overview
The ISO7220MD from Texas Instruments is a dual-channel digital isolator designed to provide galvanic isolation between two circuits. This device is part of the ISO7220x and ISO7221x family, which facilitates PCB layout by orienting the channels in the same direction for the ISO7220x series. It features a logic input and output buffer separated by TI’s silicon-dioxide (SiO2) isolation barrier, offering up to 4000VPK of isolation per VDE standards. This isolator is used in conjunction with isolated power supplies to block high voltage, isolate grounds, and prevent noise currents from interfering with sensitive circuitry.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SOIC (D) | - |
| Pins | 8 | - |
| Operating Temperature Range | -40 to 125 | °C |
| Signaling Rate Options | 1, 5, 25, 150 Mbps | - |
| Channel-to-Channel Output Skew | 1 ns Max | - |
| Pulse-Width Distortion (PWD) | 1 ns Max | - |
| Jitter Content | 1 ns Typ at 150 Mbps | - |
| Transient Immunity | 50 kV/μs Typ | - |
| Supply Voltages | 2.8V (C-Grade), 3.3V, 5V | - |
| ESD Protection | 4 kV | - |
| Isolation Voltage | 4000 VPK | - |
| Lifetime at Rated Voltage | Typical 28 years | - |
Key Features
- Low channel-to-channel output skew and pulse-width distortion (1 ns Max)
- Low jitter content (1 ns Typ at 150 Mbps)
- High transient immunity (50 kV/μs Typ)
- Operates with 2.8V (C-Grade), 3.3V, or 5V supplies
- 4 kV ESD protection
- High electromagnetic immunity
- Wide operating temperature range: -40°C to +125°C
- TTL and CMOS input thresholds available (depending on the option)
- 5V tolerant inputs when supplied from 2.8V or 3.3V
- 4mA CMOS outputs
- Safety-related certifications including DIN EN IEC 60747-17, UL 1577, IEC 62368-1, IEC 61010-1, and IEC 60601-1
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 ISO7220MD?
The ISO7220MD is a dual-channel digital isolator that provides galvanic isolation between two circuits, blocking high voltage and isolating grounds to prevent noise interference.
- What are the signaling rate options for the ISO7220MD?
The signaling rate options are 1, 5, 25, and 150 Mbps.
- What is the operating temperature range of the ISO7220MD?
The operating temperature range is -40°C to +125°C.
- What supply voltages can the ISO7220MD operate with?
The device can operate with 2.8V (C-Grade), 3.3V, or 5V supplies.
- What is the ESD protection level of the ISO7220MD?
The device has 4 kV ESD protection.
- What is the isolation voltage rating of the ISO7220MD?
The isolation voltage rating is up to 4000 VPK per VDE standards.
- What are some of the safety-related certifications for the ISO7220MD?
The device has certifications including DIN EN IEC 60747-17, UL 1577, IEC 62368-1, IEC 61010-1, and IEC 60601-1.
- What is the typical lifetime of the ISO7220MD at rated voltage?
The typical lifetime at rated voltage is 28 years.
- What are some common applications for the ISO7220MD?
Common applications include factory automation, computer peripheral interfaces, servo control interfaces, and data acquisition.
- Does the ISO7220MD have input noise filtering?
The A-option, B-option, and C-option devices have TTL input thresholds and a noise filter at the input. The M-option devices do not have the input noise filter.
