Overview
The ISO1176DW, produced by Texas Instruments, is an isolated differential line transceiver specifically designed for use in PROFIBUS and other RS-485 applications. This device is engineered to provide high electromagnetic immunity and low emissions while maintaining low power consumption. It is ideal for use in long transmission lines and environments where noise and interference are significant concerns. The ISO1176DW operates over a wide ambient temperature range of –40°C to +85°C, making it suitable for various industrial and automation settings.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| Signaling Rate | Up to 40 | Mbps | |||
| Differential Output Voltage | VCC1 = 5 V, VCC2 = 5 V, VID = 200 mV, IO = -20 μA | VCC1 - 0.1 | 5 | V | |
| 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 | |
| Output Rise/Fall Time | VCC1 at 5 V, VCC2 at 5 V | 2 | 4 | ns | |
| Isolation Voltage | 4000 | VPK | |||
| Operating Temperature | -40 | 85 | °C | ||
| Power Dissipation | VCC1 = VCC2 = 5.25 V, TJ = 150°C, CL = 15 pF | 283 | mW |
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, and 4000 VPK isolation rating per CSA 62368-1.
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 is the ISO1176DW used for?
The ISO1176DW is used as an isolated differential line transceiver in PROFIBUS and RS-485 applications, particularly in industrial and automation environments. - What are the key standards the ISO1176DW complies with?
The ISO1176DW meets or exceeds the requirements of EN 50170 and TIA/EIA-485-A standards. - What is the maximum signaling rate of the ISO1176DW?
The maximum signaling rate is up to 40 Mbps. - What is the differential output voltage of the ISO1176DW?
The differential output voltage exceeds 2.1 V with a 54 Ω load. - How many transceivers can be on a bus with the ISO1176DW?
Up to 160 transceivers can be on a bus. - What is the transient immunity of the ISO1176DW?
The device has a typical transient immunity of 50 kV/μs. - Does the ISO1176DW have fail-safe receiver functionality?
Yes, the receiver is fail-safe for bus open, short, and idle conditions. - What is the operating temperature range of the ISO1176DW?
The operating temperature range is –40°C to +85°C. - What are the safety and regulatory approvals for the ISO1176DW?
The device has approvals for 4000 VPK isolation, 560 VPK VIORM per DIN EN IEC 60747-17, 2500 VRMS isolation rating per UL 1577, and 4000 VPK isolation rating per CSA 62368-1. - What is the maximum power dissipation of the ISO1176DW?
The maximum power dissipation is 283 mW under specified conditions.
