SN75HVD07DRG4 datasheet by Texas Instruments

SN75HVD07DRG4 Frequently Asked Questions (FAQs)

• What is the maximum cable length that can be used with the SN75HVD07DRG4?
  The maximum cable length depends on the specific application and the signal frequency. As a general rule, the cable length should be limited to 100 meters or less to ensure reliable data transmission. However, it's recommended to consult the RS-485 standard and perform signal integrity analysis to determine the maximum cable length for a specific design.
• Can the SN75HVD07DRG4 be used in a multi-point configuration?
  Yes, the SN75HVD07DRG4 can be used in a multi-point configuration, but it's essential to ensure that the total bus load does not exceed the recommended value of 60 units. Additionally, the designer should consider the signal reflections and terminations to prevent data corruption.
• How do I terminate the RS-485 bus when using the SN75HVD07DRG4?
  The RS-485 bus should be terminated with a 120-ohm resistor at each end of the bus to prevent signal reflections. The termination resistors should be connected between the differential signal lines (A and B) and ground. It's also recommended to add a biasing network to ensure the bus is properly biased when no devices are driving the bus.
• What is the minimum input voltage required for the SN75HVD07DRG4 to operate correctly?
  The minimum input voltage required for the SN75HVD07DRG4 to operate correctly is 3.0V. However, it's recommended to operate the device at a minimum of 3.3V to ensure reliable operation and to account for any voltage drops in the system.
• Can the SN75HVD07DRG4 be used in a half-duplex configuration?
  Yes, the SN75HVD07DRG4 can be used in a half-duplex configuration. In this configuration, the device can transmit and receive data, but not simultaneously. The direction of data transmission is controlled by the DE (driver enable) and RE (receiver enable) pins.