Overview
The ISO15MDWR from Texas Instruments is an isolated half-duplex differential line transceiver designed for TIA/EIA 485/422 applications. This device is part of the ISO15 series, which includes the ISO15 and ISO15M, with the ISO15MDWR offering extended ambient temperature ratings. It is ideal for use in environments requiring high isolation and robust communication over long transmission lines.
The ISO15MDWR features galvanic isolation, which breaks the ground loop and allows for a larger common-mode voltage range, making it suitable for applications prone to electrical noise and transients. This isolation significantly increases protection and reduces the risk of damage to sensitive control circuits.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC1 Supply Voltage, Side 1 | 3.15 | 3.3 | 3.6 | V |
| VCC2 Supply Voltage, Side 2 | 3.15 | 3.3 | 3.6 | V |
| Signaling Rate | 1 Mbps | |||
| Operating Ambient Temperature | -55 | 125 | °C | |
| Junction Temperature | 150 | °C | ||
| Isolation Voltage | 2500 VRMS | |||
| Differential Input Resistance | 48 kΩ | |||
| Differential Output Voltage Magnitude | 1.5 V | 2 V |
Key Features
- Meets or exceeds TIA/EIA RS-485 requirements
- 1/8 unit load – Up to 256 nodes on a bus
- Signaling rates up to 1 Mbps
- Thermal shutdown protection
- Low bus capacitance – 16 pF (typical)
- 50 kV/μs typical transient immunity
- Fail-safe receiver for bus open, short, idle
- 3.3-V inputs are 5-V tolerant
- Safety and regulatory approvals – 4000-VPK VIOTM, 560-VPK VIORM per DIN EN IEC 60747-17 (VDE 0884-17), 2500 VRMS isolation rating per UL 1577 and CSA 62368-1
Applications
- Security systems
- Chemical production
- Factory automation
- Motor and motion control
- HVAC and building automation networks
- Networked security stations
Q & A
- What is the primary function of the ISO15MDWR?
The ISO15MDWR is an isolated half-duplex differential line transceiver designed for TIA/EIA 485/422 applications.
- What are the operating temperature ranges for the ISO15MDWR?
The ISO15MDWR operates over an ambient temperature range of -55°C to 125°C.
- What is the maximum signaling rate of the ISO15MDWR?
The maximum signaling rate is up to 1 Mbps.
- What is the isolation voltage rating of the ISO15MDWR?
The isolation voltage rating is 2500 VRMS.
- Is the ISO15MDWR compliant with any safety standards?
Yes, it meets safety and regulatory approvals such as 4000-VPK VIOTM, 560-VPK VIORM per DIN EN IEC 60747-17 (VDE 0884-17), and 2500 VRMS isolation rating per UL 1577 and CSA 62368-1.
- What are some common applications for the ISO15MDWR?
Common applications include security systems, chemical production, factory automation, motor and motion control, HVAC and building automation networks, and networked security stations.
- What is the typical transient immunity of the ISO15MDWR?
The typical transient immunity is 50 kV/μs.
- Does the ISO15MDWR have thermal shutdown protection?
Yes, it includes thermal shutdown protection.
- How many nodes can be supported on a bus with the ISO15MDWR?
Up to 256 nodes can be supported on a bus due to its 1/8 unit load.
- Are the inputs of the ISO15MDWR 5-V tolerant?
Yes, the 3.3-V inputs are 5-V tolerant.
