SLLSF22G April 2018 – June 2020
UNLESS OTHERWISE NOTED, this document contains PRODUCTION DATA.
The current supplied by the driver must supply into a load because the output of the driver depends on this current. Add transceivers to the bus to increase the total bus loading. The RS-485 standard specifies a hypothetical term of a unit load (UL) to estimate the maximum number of possible bus loads. The UL represents a load impedance of approximately 12 kΩ. Standard-compliant drivers must be able to drive 32 of these ULs.
The ISO14xx devices have 1/8 UL impedance transceiver and can connect up to 256 nodes to the bus.