Overview
The SN75176A differential bus transceiver, produced by Texas Instruments, is a monolithic integrated circuit designed for bidirectional data communication on multipoint bus-transmission lines. It is optimized for balanced transmission lines and meets the requirements of ANSI Standard EIA/TIA-422-B and ITU Recommendation V.11. The device combines a 3-state differential line driver and a differential input line receiver, both operating from a single 5-V power supply. It features active-high and active-low enables for the driver and receiver, respectively, which can be externally connected to function as a direction control.
The SN75176A is suitable for party-line applications due to its wide positive and negative common-mode voltage ranges. It includes protection features such as positive- and negative-current limiting and thermal shutdown, which occurs at a junction temperature of approximately 150°C. The device is characterized for operation from 0°C to 70°C, making it versatile for various environmental conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (VCC) | 4.75 | 5 | 5.25 | V |
| High-Level Input Voltage (VIH) | 2 | V | ||
| Low-Level Input Voltage (VIL) | 0.8 | V | ||
| Differential Input Voltage (VID) | ±12 | V | ||
| High-Level Output Current (IOH) | -60 | mA | ||
| Low-Level Output Current (IOL) | 60 | mA | ||
| Operating Free-Air Temperature (TA) | 0 | 70 | °C | |
| Receiver Input Impedance | 12 kΩ | |||
| Receiver Input Sensitivity | ±200 mV | |||
| Receiver Input Hysteresis | 50 mV |
Key Features
- Bidirectional transceiver for multipoint bus-transmission lines
- Meets or exceeds ANSI Standard EIA/TIA-422-B and ITU Recommendation V.11
- Designed for balanced transmission lines in noisy environments
- 3-state driver and receiver outputs
- Individual driver and receiver enables
- Wide positive and negative input/output bus voltage ranges
- Driver output capability ±60 mA max
- Thermal-shutdown protection at approximately 150°C junction temperature
- Positive- and negative-current limiting
- Receiver input impedance of 12 kΩ min, input sensitivity of ±200 mV, and input hysteresis of 50 mV typ
- Operates from a single 5-V power supply
- Lower power requirements
Applications
- Low-speed RS485 communication (5 Mbps or less)
- For 10 Mbps, use the SN75176B
- Transmission-line applications employing the SN75172 and SN75174 quadruple differential line drivers and SN75173 and SN75175 quadruple differential line receivers
Q & A
- What are the primary standards that the SN75176A meets or exceeds?
The SN75176A meets or exceeds the requirements of ANSI Standard EIA/TIA-422-B and ITU Recommendation V.11.
- What is the operating voltage range for the SN75176A?
The SN75176A operates from a single 5-V power supply.
- What are the key protection features of the SN75176A?
The device features thermal-shutdown protection, positive- and negative-current limiting, and high input impedance.
- What is the maximum output current capability of the driver?
The driver can handle loads up to ±60 mA of sink or source current.
- What is the typical input hysteresis of the receiver?
The receiver has a typical input hysteresis of 50 mV.
- What are the common applications of the SN75176A?
The SN75176A is commonly used in low-speed RS485 communication and transmission-line applications.
- Can the driver and receiver be individually enabled or disabled?
Yes, both the driver and receiver can be individually enabled or disabled in any combination.
- What is the operating temperature range for the SN75176A?
The device is characterized for operation from 0°C to 70°C.
- Does the SN75176A have thermal shutdown protection?
Yes, the device features thermal shutdown protection that occurs at a junction temperature of approximately 150°C.
- What are the package options available for the SN75176A?
The SN75176A is available in SOIC (8-pin) and PDIP (8-pin) packages.
