SN75HVD12DRG4 datasheet by Texas Instruments

SN75HVD12DRG4 Frequently Asked Questions (FAQs)

• What is the maximum cable length that can be used with the SN75HVD12DRG4?
  The maximum cable length depends on the baud rate and the type of cable used. As a general rule, the maximum cable length is around 100 meters at 9600 bps and 10 meters at 115200 bps. 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.
• Can the SN75HVD12DRG4 be used in a multi-point configuration?
  Yes, the SN75HVD12DRG4 can be used in a multi-point configuration, but it requires a common ground connection between all devices. Additionally, the total bus length and the number of devices connected to the bus should be limited to ensure reliable communication.
• How do I terminate the RS-485 bus when using the SN75HVD12DRG4?
  The RS-485 bus should be terminated with a 120-ohm resistor at each end of the bus to prevent signal reflections and ensure reliable communication. The termination resistors should be connected between the differential signal lines (A and B) and ground.
• Can the SN75HVD12DRG4 be used in a half-duplex or full-duplex configuration?
  The SN75HVD12DRG4 is a half-duplex transceiver, meaning it can only transmit or receive data at a time. It cannot transmit and receive data simultaneously. If full-duplex communication is required, a separate transmitter and receiver IC should be used.
• What is the minimum input voltage required for the SN75HVD12DRG4 to operate?
  The minimum input voltage required for the SN75HVD12DRG4 to operate is 3.0V. However, it's recommended to operate the device at a minimum of 3.3V to ensure reliable operation and to meet the RS-485 standard.