Overview
The SN75ALS1177NSR is a dual differential driver and receiver integrated circuit designed by Texas Instruments for bidirectional data communication on multipoint bus transmission lines. This device is optimized for balanced transmission lines and complies with TIA/EIA-422-B and TIA/EIA-485-A standards. It combines dual 3-state differential line drivers and dual 3-state differential input line receivers, both operating from a single 5V power supply. The SN75ALS1177NSR is characterized for operation from 0°C to 70°C, making it suitable for a variety of industrial and commercial applications.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | 16-SOIC (NS) | |
| Number of Drivers/Receivers | 2/2 | |
| Supply Voltage (VCC) | 4.75 to 5.25 | V |
| Operating Temperature Range | 0 to 70 | °C |
| Driver Common-Mode Output Voltage | –7 to 12 | V |
| Receiver Common-Mode Input Voltage | –12 to 12 | V |
| Receiver Input Sensitivity | ±200mV | |
| Receiver Hysteresis | 50mV (typical) | |
| Receiver Input Impedance | 12kΩ (minimum) | |
| Mounting Type | Surface Mount |
Key Features
- Meets or exceeds TIA/EIA-422-B and TIA/EIA-485-A standards.
- Designed for multipoint bus transmission on long bus lines in noisy environments.
- Low supply-current requirement: 50mA maximum.
- Driver positive- and negative-current limiting.
- Thermal shutdown protection for drivers.
- 3-state outputs with active-high enable for drivers and active-low enable for receivers.
- Fail-safe design ensures receiver outputs are always high when inputs are open.
- Operates from a single 5V power supply.
Applications
- Motor drives and control systems.
- Factory automation and industrial control systems.
- Building automation and control systems.
- Long-distance data communication over multipoint bus lines.
Q & A
- What are the primary standards that the SN75ALS1177NSR complies with?
The SN75ALS1177NSR complies with TIA/EIA-422-B and TIA/EIA-485-A standards.
- What is the operating temperature range of the SN75ALS1177NSR?
The operating temperature range is from 0°C to 70°C.
- What is the supply voltage range for the SN75ALS1177NSR?
The supply voltage range is from 4.75V to 5.25V.
- How many drivers and receivers does the SN75ALS1177NSR have?
The device has 2 drivers and 2 receivers.
- What is the common-mode output voltage range for the drivers?
The common-mode output voltage range for the drivers is –7V to 12V.
- What is the input sensitivity of the receivers?
The input sensitivity of the receivers is ±200mV.
- Does the SN75ALS1177NSR have thermal shutdown protection?
- How do the enable controls work for the drivers and receivers?
The drivers have active-high enables, and the receivers have active-low enables. These can be externally connected to function as direction control.
- What is the fail-safe design feature of the SN75ALS1177NSR?
The fail-safe design ensures that when the receiver inputs are open, the receiver outputs are always high.
- What type of mounting does the SN75ALS1177NSR use?
The device uses surface mount technology.
