The maximum cable length depends on the data rate and cable characteristics. As a general guideline, for a data rate of 1 Mbps, the maximum cable length is around 100 meters. However, it's recommended to consult the RS-485 standard and perform signal integrity analysis to determine the maximum cable length for a specific application.
Proper termination is critical in an RS-485 network to prevent signal reflections and ensure reliable data transmission. A 120-ohm resistor should be connected between the differential lines (A and B) at each end of the bus. Additionally, a 220-ohm resistor can be connected in series with a 220-pF capacitor between the lines and ground at the receiver end to improve signal quality.
Yes, the SN75115DR can be used in half-duplex or multi-drop configurations. In half-duplex mode, the transmitter and receiver are switched using the DE (driver enable) and RE (receiver enable) pins. In multi-drop mode, multiple transceivers can be connected to the same bus, and each device can be addressed using a unique identifier.
The recommended operating supply voltage for the SN75115DR is between 4.75 V and 5.25 V. However, the device can operate with a supply voltage as low as 4.5 V and as high as 5.5 V, but with reduced performance and reliability.
Hot-swapping or inserting/removing devices in an RS-485 network can cause signal disturbances and errors. To minimize these effects, it's recommended to use a bus repeater or a buffer device to isolate the bus segments and prevent signal reflections. Additionally, the devices should be designed to handle the insertion and removal of devices without causing errors or data loss.
Trust Checks
This model has been provided by community users.
Community Provided
This model has been verified by system checks.
System Verified
This model has been reviewed by community users.
Community Approved
Sponsored
SN75115DR Overview
Use the download button to access the SN75115DR schematic symbol, PCB footprint, and 3D model.
To find more CAD model downloads similar to this part, try a partial part number search, like SN751,
or try a keyword search, such as Line Driver or Receivers
About Texas Instruments
Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.
