SN65LBC176QDR

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The SN65LBC176QDR from Texas Instruments is an high-performance RS-485 transceiver interface device with superior input/output common-mode transient immunity, which enables it appropriate for long-drop and electrically noisy networks. It performs a successful communication of half-duplex data over balanced line and its working principle is simple and interesting. This article will discuss the application field and working principle of the SN65LBC176QDR in detail.

Application Field of the SN65LBC176QDR

Due to its superior input/output common-mode transient immunity, the SN65LBC176QDR is particularly suitable for communication in electrically noisy environment, e.g. RS-485 networks. Besides, it also has high data-rate modulation and several high-integrity features which make it applicable in systems requiring reliable communication, such as building and factory automation, automotive, industrial, and medical applications.

In addition, the SN65LBC176QDR is widely used for half-duplex communication because of its low propagation delay, data skew and true fail-safe operation. Moreover, the robust on-chip output-enable control ensures reliable and clean logic-level enable/disable control by eliminating the AC line transients that might occur in open-collector or other types of output enable control. With these features, the SN65LBC176QDR transceiver offers a cost-effective and robust solution for many long-drop and electrically noisy networks.

Working Principle of the SN65LBC176QDR

The SN65LBC176QDR is an dual asynchronous receiver-transmitter that supports Slave Selects (SS) input to select the slaves and data framing capabilities. The device operates on a single 3.3V power supply, and the receivers accept 5V logic inputs. The transceiver can be configured to provide one of four differential line pair termination settings by setting the TERM jumper.

The transmitting waveform is generated directly from an on-chip transmitter first-level converter. The differential output is at 7.0–11.2V, most commonly 16V. An on-chip receiver first-level converter is used to translate the differential waveform back to a logic waveform. The receiver has a threshold of about 2.5V for the logic 0 detection, and about -2.5V for the logic 1 detection. Its switching levels are anywhere between 0V and 3V, which is dependent on the applied VCC.

The SN65LBC176QDR is an open-drain transceiver, with both the transmitter and receiver having an open-drain output. The open-drain output allows multiple nodes to be connected, by having the outputs of the transmitters of each node connected to the inputs of the receivers of the other nodes. This connection allows bidirectional data communication between the nodes. The high-integrity features provide for reliable and robust communication even in electrically noisy environments.

Conclusion

The SN65LBC176QDR from Texas Instruments is an high-performance RS-485 transceiver interface device. It is suitable for communication in electrically noisy environment, and excels in half-duplex data transmission over long-drop and electrically noisy networks. Its working principle is simple, and it is designed with many high-integrity features that provide robust communication. Therefore, the SN65LBC176QDR is widely used in systems requiring reliable communication and has a wide application field.

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