Overview
The SN65ALS176D, produced by Texas Instruments, is a differential bus transceiver designed for bidirectional data communication on multipoint bus transmission lines. This integrated circuit meets or exceeds the requirements of TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendations V.11 and X.27. It combines a 3-state, differential line driver and a differential input line receiver, both operating from a single 5-V power supply. The device is suitable for balanced transmission lines and is characterized for operation from –40°C to 85°C, making it versatile for various industrial and communication applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Supply Voltage | 4.75 | 5 | 5.25 | V |
| VI or VIC Input Voltage | -7 | 12 | V | |
| VID Differential Input Voltage | -12 | 12 | V | |
| IOH High-Level Output Current (Driver) | -60 | mA | ||
| IOL Low-Level Output Current (Driver) | 60 | mA | ||
| TA Operating Free-Air Temperature | -40 | 85 | °C | |
| td(OD) Differential Output Delay Time | 15 | 15 | ns | |
| tsk(p) Pulse Skew | 0 | 2 | ns | |
| tsk(lim) Skew Limit | 15 | ns |
Key Features
- Meets or exceeds the requirements of TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendations V.11 and X.27.
- Operates at data rates up to 35 Mbaud.
- Four skew limits available: SN65ALS176 (15 ns), SN75ALS176 (10 ns), SN75ALS176A (7.5 ns), SN75ALS176B (5 ns).
- Designed for multipoint transmission on long bus lines in noisy environments.
- Low supply-current requirements: 30 mA max.
- Wide positive and negative input/output bus-voltage ranges.
- Thermal shutdown protection.
- Driver positive and negative current limiting.
- Receiver input hysteresis.
- Glitch-free power-up and power-down protection.
- Receiver open-circuit fail-safe design.
Applications
- Multipoint bus transmission lines.
- Noisy industrial environments.
- RS-422 and RS-485 communication systems.
- Party-line applications.
- Industrial automation and control systems.
- Telecommunication equipment.
Q & A
- What are the operating temperature ranges for the SN65ALS176D?
The SN65ALS176D operates from –40°C to 85°C.
- What are the key standards that the SN65ALS176D complies with?
The device meets or exceeds the requirements of TIA/EIA-422-B, TIA/EIA-485-A, and ITU Recommendations V.11 and X.27.
- What is the maximum data rate supported by the SN65ALS176D?
The device operates at data rates up to 35 Mbaud.
- What are the skew limits available for the SN65ALS176 series?
The skew limits are 15 ns for SN65ALS176, 10 ns for SN75ALS176, 7.5 ns for SN75ALS176A, and 5 ns for SN75ALS176B.
- What is the maximum supply current requirement for the SN65ALS176D?
The maximum supply current requirement is 30 mA.
- Does the SN65ALS176D have thermal shutdown protection?
Yes, the device features thermal shutdown protection.
- What is the purpose of the receiver input hysteresis in the SN65ALS176D?
The receiver input hysteresis helps in reducing the effect of noise on the input signals.
- Is the SN65ALS176D designed for glitch-free power-up and power-down?
Yes, the device is designed to provide glitch-free power-up and power-down protection.
- What is the significance of the receiver open-circuit fail-safe design in the SN65ALS176D?
The receiver open-circuit fail-safe design ensures that the receiver output remains in a known state even if the input lines are open-circuited.
- In what types of environments is the SN65ALS176D typically used?
The device is typically used in noisy industrial environments and multipoint bus transmission lines.
