The DS36277 Dominant Mode Multipoint Transceiver is designed for use on bi-directional
differential busses. It is optimal for use on Interfaces that utilize Society of Automotive
Engineers (SAE) J1708 Electrical Standard.
The device is similar to standard TIA/EIA-485 transceivers, but differs in enabling
scheme. The Driver's Input is normally externally tied LOW, thus providing only two states: Active
(LOW), or Disabled (OFF). When the driver is active, the dominant mode is LOW, conversely, when the
driver is disabled, the bus is pulled HIGH by external bias resistors.
The receiver provides a FAILSAFE feature that ensures a known output state when the
Interface is in the following conditions: Floating Line, Idle Line (no active drivers), and Line
Fault Conditions (open or short). The receiver output is HIGH for the following conditions: Open
Inputs, Terminated Inputs (50Ω), or Shorted Inputs. FAILSAFE is a highly desirable feature when the
transceivers are used with Asynchronous Controllers such as UARTs.
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