Overview
The SN75179B is a differential driver and receiver pair designed by Texas Instruments for balanced transmission-line applications. It meets or exceeds the requirements of TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11. This device is optimized for improving the performance of full-duplex data communications over long bus lines. It operates from a single 5-V supply and features low power requirements, making it suitable for a variety of communication systems.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.75 | 5 | 5.25 | V |
| Bus Voltage Range | -7 | 12 | V | |
| Driver Output Current | 60 | mA | ||
| Receiver Input Impedance | 12 kΩ | |||
| Receiver Input Sensitivity | ±200 mV | |||
| Receiver Input Hysteresis | 50 mV | |||
| Operating Temperature Range | 0°C | 70°C | ||
| Thermal Shutdown Junction Temperature | 150°C |
Key Features
- Meets or exceeds the requirements of TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11.
- Bus voltage range: –7 V to 12 V.
- Positive- and negative-current limiting.
- Driver output capability: up to 60 mA.
- Driver thermal-shutdown protection.
- Receiver input impedance: minimum 12 kΩ.
- Receiver input sensitivity: ±200 mV.
- Receiver input hysteresis: 50 mV typical.
- Operates from a single 5-V supply.
- Low power requirements.
Applications
The SN75179B is designed for use in various data communication systems, including but not limited to:
- Industrial control systems.
- Point-of-sale terminals.
- Remote terminals.
- Process control systems.
- Any application requiring reliable, long-distance data transmission over balanced lines.
Q & A
- What are the primary standards that the SN75179B complies with?
The SN75179B meets or exceeds the requirements of TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11. - What is the operating voltage range for the SN75179B?
The SN75179B operates from a single 5-V supply, with a voltage range of 4.75 V to 5.25 V. - What is the maximum driver output current of the SN75179B?
The maximum driver output current is 60 mA. - What is the input impedance of the receiver in the SN75179B?
The receiver input impedance is a minimum of 12 kΩ. - What is the input sensitivity of the receiver in the SN75179B?
The receiver input sensitivity is ±200 mV. - Does the SN75179B have thermal protection?
Yes, the SN75179B features driver thermal-shutdown protection at approximately 150°C junction temperature. - What are the typical operating temperature ranges for the SN75179B?
The device is characterized for operation from 0°C to 70°C. - What types of packages are available for the SN75179B?
The SN75179B is available in SOIC (D), PDIP (P), and SOP (PS) packages. - What are some common applications for the SN75179B?
Common applications include industrial control systems, point-of-sale terminals, remote terminals, and process control systems. - Does the SN75179B support full-duplex data communication?
Yes, the SN75179B is designed to improve the performance of full-duplex data communications over long bus lines.
