Overview
The SN75ALS180D is a differential driver and receiver pair integrated circuit designed by Texas Instruments. This device is optimized for bidirectional data communication on multipoint bus-transmission lines and complies with the requirements of TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11. The SN75ALS180D operates from a single 5-V power supply and features a 3-state differential line driver and a differential input line receiver. It is particularly suited for party-line applications due to its wide positive and negative common-mode voltage ranges.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VCC Supply Voltage | 4.75 | 5 | 5.25 | V |
| Operating Temperature Range | 0 | 70 | °C | |
| Input Clamp Voltage | -1.5 | V | ||
| Differential Output Voltage (RL = 100 Ω) | 1.5 | 6 | V | |
| Receiver Input Impedance | 12 | kΩ | ||
| Receiver Input Sensitivity | ±200 | mV | ||
| Driver Output Current | ±60 | mA | ||
| Supply Current | 30 | mA |
Key Features
- High-speed advanced low-power Schottky circuitry
- Designed for 25-Mbaud operation in both serial and parallel applications
- Low skew between devices: 6 ns max
- Low supply-current requirements: 30 mA max
- Individual driver and receiver I/O pins with dual VCC and dual GND
- Wide positive and negative input/output bus voltage ranges
- Driver output capacity: ±60 mA
- Thermal shutdown protection and driver positive- and negative-current limiting
- Glitch-free power-up and power-down protection
Applications
The SN75ALS180D is suitable for various applications requiring reliable and high-speed data transmission over multipoint bus lines. These include industrial control systems, data acquisition systems, and any environment where TIA/EIA-422-B or TIA/EIA-485-A compliant communication is necessary. The device's ability to operate in both serial and parallel applications makes it versatile for different system designs.
Q & A
- What are the primary standards that the SN75ALS180D complies with?
The SN75ALS180D complies with TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendation V.11. - What is the operating voltage range of the SN75ALS180D?
The device operates from a single 5-V power supply with a voltage range of 4.75 V to 5.25 V. - What is the maximum operating temperature of the SN75ALS180D?
The maximum operating temperature is 70°C. - What is the maximum differential output voltage of the driver?
The maximum differential output voltage is 6 V when RL = 100 Ω. - Does the SN75ALS180D have thermal protection?
Yes, it features thermal shutdown protection. - What is the receiver input impedance?
The receiver input impedance is a minimum of 12 kΩ. - What is the driver output current capacity?
The driver output current capacity is ±60 mA. - Is the SN75ALS180D suitable for party-line applications?
Yes, it is suitable due to its wide positive and negative common-mode voltage ranges. - What is the typical skew between devices?
The typical skew between devices is 6 ns max. - Is the SN75ALS180D still in production?
No, the SN75ALS180D is obsolete and not recommended for new designs.
