8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and

TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

8.1 Application Information

THVD2410 and THVD2450 are fault-protected, half-duplex RS-485 transceivers commonly used for

asynchronous data transmissions. For these devices, the driver and receiver enable pins allow for the

configuration of different operating modes.

8.2 Typical Application

An RS-485 bus consists of multiple transceivers connecting in parallel to a bus cable. To eliminate line

reflections, each cable end is terminated with a termination resistor, RT, whose value matches the characteristic

impedance, Z0, of the cable. This method, known as parallel termination, generally allows for higher data rates

over longer cable length.

RT

RT

R

A

B

R RE DE D

D

R

A

B

R RE DE D

D

R

D

R

RE

DE

D

A

B

R

D

R

RE

DE

D

A

B

Figure 8-1. Typical RS-485 Network With Half-Duplex Transceivers

8.2.1 Design Requirements

RS-485 is a robust electrical standard suitable for long-distance networking that may be used in a wide range of

applications with varying requirements, such as distance, data rate, and number of nodes.

8.2.1.1 Data Rate and Bus Length

There is an inverse relationship between data rate and cable length, which means the higher the data rate, the

short the cable length; and conversely, the lower the data rate, the longer the cable length. While most RS-485

systems use data rates between 10kbps and 100kbps, some applications require data rates up to 250kbps at

distances of 4000 feet and longer. Longer distances are possible by allowing for small signal jitter of up to 5 or

10%.

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THVD2410V-EP, THVD2450V-EP, THVD2452V-EP

SLLSFQ9B – MAY 2024 – REVISED OCTOBER 2024

Copyright © 2024 Texas Instruments Incorporated

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