Overview
The ISO35DW from Texas Instruments is a 1-Mbps, full-duplex, isolated RS-485 and RS-422 transceiver. This device is designed to meet or exceed the TIA/EIA RS-485 requirements, making it suitable for a wide range of industrial and commercial applications. The ISO35DW features high-speed data transmission, robust isolation, and various protective mechanisms to ensure reliable operation in harsh environments.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Signaling Rate | - | 1 | - | Mbps |
| Operating Junction Temperature | -40 | - | 150 | °C |
| Isolation Voltage (VIORM) | - | - | 2500 | VRMS |
| Isolation Voltage (VIOTM) | - | - | 4000 | VPK |
| Differential Input Resistance | 48 | - | - | kΩ |
| Bus Capacitance | - | 16 | - | pF |
| Transient Immunity | - | 50 | - | kV/μs |
| High-Level Input Current (RE) | -10 | - | - | μA |
| Low-Level Input Current (RE) | -10 | - | - | μA |
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 maximum signaling rate of the ISO35DW?
The ISO35DW supports signaling rates up to 1 Mbps. - What is the operating junction temperature range for the ISO35DW?
The operating junction temperature range is from -40°C to 150°C. - What is the isolation voltage rating for the ISO35DW?
The isolation voltage rating is 2500 VRMS per UL 1577 and CSA 62368-1, and 4000 VPK VIOTM. - Is the ISO35DW compatible with 5-V inputs?
Yes, the 3.3-V inputs are 5-V tolerant. - What is the typical bus capacitance of the ISO35DW?
The typical bus capacitance is 16 pF. - Does the ISO35DW have thermal shutdown protection?
Yes, it includes thermal shutdown protection. - What are the safety and regulatory approvals for the ISO35DW?
The device has approvals for 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. - How many nodes can be supported on a bus with the ISO35DW?
Up to 256 nodes can be supported due to its 1/8 unit load. - What kind of transient immunity does the ISO35DW offer?
The device offers 50 kV/μs typical transient immunity. - What are some common applications for the ISO35DW?
Common applications include security systems, chemical production, factory automation, motor and motion control, HVAC and building automation networks, and networked security stations.
