Overview
The SN65176BP differential bus transceiver, produced by Texas Instruments, is designed for bidirectional data communication on multipoint bus transmission lines. These devices combine a 3-state differential line driver and a differential input line receiver, both operating from a single 5-V power supply. They are compliant with ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A, as well as ITU Recommendations V.11 and X.27, making them suitable for balanced transmission lines in noisy environments.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Operating Free-Air Temperature | -40 | 105 | °C | |
| Supply Voltage (VCC) | 4.75 | 5 | 5.25 | V |
| Driver Output Current (IOH/IOL) | -60 | 60 | mA | |
| Receiver Input Impedance | 12 | kΩ | ||
| Receiver Input Sensitivity | ±200 | mV | ||
| Receiver Input Hysteresis | 50 | mV | ||
| Differential Output Delay Time (td(OD)) | 15 | 22 | 30 | ns |
| Differential Output Transition Time (tt(OD)) | 20 | 30 | ns | |
| Output Enable Time to High Level (tPZH) | 85 | 120 | ns | |
| Output Disable Time from High Level (tPHZ) | 150 | 250 | ns | |
| Package Type | SOIC (8) | |||
| Body Size (Nominal) | 4.90 mm × 3.91 mm |
Key Features
- Bidirectional transceivers for multipoint transmission on long bus lines in noisy environments.
- Compliant with ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A, and ITU Recommendations V.11 and X.27.
- 3-State driver and receiver outputs.
- Individual driver and receiver enables.
- Wide positive and negative input/output bus voltage ranges.
- Up to 60 mA of sink or source current capability.
- Positive and negative current limiting and thermal shutdown protection.
- Minimum receiver input impedance of 12 kΩ and input sensitivity of ±200 mV.
- Typical receiver input hysteresis of 50 mV.
Applications
- Chemical and gas sensors.
- Digital signage.
- Human Machine Interfaces (HMI).
- Motor controls: AC induction, brushed and brushless DC, low- and high-voltage, stepper motors, and permanent magnets.
- TETRA Base stations.
- Telecom towers: remote electrical tilt units (RET) and tower-mounted amplifiers (TMA).
- Weigh scales.
- Wireless repeaters.
Q & A
- What are the primary standards that the SN65176BP complies with?
The SN65176BP complies with ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A, as well as ITU Recommendations V.11 and X.27.
- What is the operating voltage range for the SN65176BP?
The SN65176BP operates from a single 5-V power supply, with a voltage range of 4.75 V to 5.25 V.
- What is the maximum driver output current capability of the SN65176BP?
The driver can sink or source up to 60 mA of current.
- What are the key protection features of the SN65176BP?
The device features positive and negative current limiting and thermal shutdown protection, with thermal shutdown occurring at approximately 150°C.
- What is the minimum receiver input impedance of the SN65176BP?
The minimum receiver input impedance is 12 kΩ.
- What are the typical applications of the SN65176BP?
Typical applications include chemical and gas sensors, digital signage, HMI, motor controls, TETRA base stations, telecom towers, weigh scales, and wireless repeaters.
- How do the driver and receiver enables function in the SN65176BP?
The driver and receiver have active-high and active-low enables, respectively, which can be connected externally to function as a direction control.
- What is the significance of the 3-state driver and receiver outputs in the SN65176BP?
The 3-state driver and receiver outputs allow for minimum loading to the bus when the driver is disabled or VCC = 0.
- What are the thermal metrics for the SN65176BP?
The device has a junction-to-ambient thermal resistance (RθJA) of 114.4°C/W for the SOIC package.
- How should the SN65176BP be used in RS-485 and RS-422 applications?
The device should be used with a 5-V power source, and the RS-485 bus should operate at 10 Mbps or less. External fail-safe biasing may be added to ensure +200 mV on the A-B port.
