Overview
The ISO1176DWR, produced by Texas Instruments, is an isolated differential RS-485/Profibus transceiver designed to meet or exceed the requirements of EN 50170 and TIA/EIA-485-A standards. This device is optimized for high-speed data transmission and provides robust protection against noise and electrical transients. It operates over a wide ambient temperature range of –40°C to +85°C, making it suitable for various industrial and automation applications.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Signaling Rate | 40 | Mbps | |||
| Differential Output Voltage | VCC1 at 5 V, VCC2 at 5 V, VID = 200 mV, IO = -20 μA | VCC1 - 0.1 | 5 | V | |
| Low-Level Output Voltage | VCC1 at 5 V, VCC2 at 5 V, VID = -200 mV, IO = 8 mA | 0.2 | 0.4 | V | |
| Bus-Pin ESD Protection | Between bus pins and GND2 | 16 | kV HBM | ||
| Bus-Pin ESD Protection | Between bus pins and GND1 | 6 | kV HBM | ||
| Isolation Voltage | 4000 VPK | VPK | |||
| Maximum Power Dissipation | VCC1 = VCC2 = 5.25 V, TJ = 150°C, CL = 15 pF | 283 | mW | ||
| Propagation Delay | VCC1 at 5 V, VCC2 at 5 V | 35 | 50 | ns | |
| Pulse Skew | VCC1 at 5 V, VCC2 at 5 V | 2 | 7.5 | ns | |
| Differential Output Rise/Fall Time | VCC1 at 5 V, VCC2 at 5 V | 2 | 7.5 | ns |
Key Features
- Meets or exceeds the requirements of EN 50170 and TIA/EIA-485-A standards.
- Signaling rates up to 40 Mbps.
- Differential output exceeds 2.1 V (54 Ω load).
- Low bus capacitance – 10 pF (maximum).
- Up to 160 transceivers on a bus.
- 50 kV/μs typical transient immunity.
- Fail-safe receiver for bus open, short, idle conditions.
- 3.3 V inputs are 5 V tolerant.
- Bus-pin ESD protection: 16 kV HBM between bus pins and GND2, 6 kV HBM between bus pins and GND1.
- Safety and regulatory approvals: 4000 VPK isolation, 560 VPK VIORM per DIN EN IEC 60747-17, 2500 VRMS isolation rating per UL 1577.
Applications
- Profibus networks.
- Factory automation.
- Networked sensors.
- Motor and motion control systems.
- HVA (Heating, Ventilation, and Air Conditioning) and building automation networks.
- Networked security stations.
Q & A
- What are the key standards that the ISO1176DWR complies with?
The ISO1176DWR meets or exceeds the requirements of EN 50170 and TIA/EIA-485-A standards.
- What is the maximum signaling rate of the ISO1176DWR?
The maximum signaling rate is up to 40 Mbps.
- What is the differential output voltage of the ISO1176DWR?
The differential output voltage exceeds 2.1 V with a 54 Ω load.
- How many transceivers can be connected on a bus using the ISO1176DWR?
Up to 160 transceivers can be connected on a bus.
- What is the transient immunity of the ISO1176DWR?
The device has a typical transient immunity of 50 kV/μs.
- Does the ISO1176DWR have fail-safe receiver functionality?
Yes, it has fail-safe receiver functionality for bus open, short, and idle conditions.
- What is the ESD protection level of the ISO1176DWR?
The device has bus-pin ESD protection of 16 kV HBM between bus pins and GND2, and 6 kV HBM between bus pins and GND1.
- What are the safety and regulatory approvals for the ISO1176DWR?
The device has 4000 VPK isolation, 560 VPK VIORM per DIN EN IEC 60747-17, and a 2500 VRMS isolation rating per UL 1577.
- What is the operating temperature range of the ISO1176DWR?
The device operates over an ambient temperature range of –40°C to +85°C.
- What are some common applications of the ISO1176DWR?
Common applications include Profibus networks, factory automation, networked sensors, motor and motion control systems, HVA and building automation networks, and networked security stations.
