DS75176BM

Overview

The DS75176BM is a multipoint RS-485/RS-422 transceiver manufactured by Texas Instruments in an 8-pin SOIC package. It operates on a single +5V supply (4.75V to 5.25V) with a bus common mode range of -7V to +12V, allowing up to ±7V ground difference between devices. The device supports data rates up to 10 Mb/s with driver propagation delays of 22 ns typical. It features TRI-STATE outputs, thermal shutdown protection, and high impedance when powered off. The combined impedance of the driver output and receiver input is less than one RS-485 unit load, supporting up to 32 transceivers on the bus.

Feature Summary

• Supports multipoint communication on RS-485 and RS-422 buses with extended common mode range.
• Includes TRI-STATE capability for driver and receiver outputs to manage bus contention.
• Features thermal shutdown protection that forces driver outputs to high impedance during excessive power dissipation.
• High impedance state persists over the entire DC common mode range when the driver is disabled or power is off.

Applications

• Multipoint data transmission systems requiring RS-485 compliance.
• Industrial control networks utilizing differential bus communication.
• Systems compatible with SN75176A/B pinouts.

Procurement Notes

Verify the specific ordering suffix and package type against current TI documentation before procurement. Confirm RoHS compliance status as indicated in the Package Option Addendum. Check for lifetime buy availability since the device status is listed as LIFEBUY. Ensure the operating temperature range matches the application requirements for the BM variant.

Selection Notes

Select the DS75176BM for designs requiring RS-485/RS-422 compatibility with a small outline package. Ensure the system operates within the 0°C to 70°C temperature range specified for this part number. Verify that the bus topology supports up to 32 units due to the low combined impedance characteristic. Consider the thermal shutdown feature for fault tolerance in industrial environments.

Part Context

The DS75176B series includes variants like the DS75176BT for extended temperature ranges. The BM suffix specifically denotes the SOIC package version intended for surface mount applications. This component is part of Texas Instruments' legacy interface IC portfolio designed for robust differential signaling.

Replacement Considerations

The SN75176B is a pin-compatible alternative within the same family. Verify if the SN75176B meets the specific package and temperature requirements of the original design.

FAQ

What is the maximum number of transceivers supported on the bus?

Up to 32 transceivers can be connected to the bus because the combined impedance of a driver output and receiver input is less than one RS-485 unit load.

How does the device handle bus contention or fault situations?

A thermal shutdown circuit detects excessive power dissipation caused by bus contention or shorts and forces the driver outputs into a high impedance state.

What is the typical receiver hysteresis value?

The typical receiver hysteresis is 70 mV, which helps prevent false triggering due to noise on the bus lines.