SLLS236J October 1996 – July 2024 SN65LBC184 , SN75LBC184
PRODUCTION DATA
When connecting a node to the bus, the distance between the transceiver inputs and the cable trunk, known as the stub, should be as short as possible. Stubs present a nonterminated piece of bus line which can introduce reflections as the length of the stub increases. As a general guideline, the electrical length, or round-trip delay, of a stub should be less than one-tenth of the rise time of the driver, thus giving a maximum physical stub length as shown in Equation 1.
where
Per Equation 1, cable-stub lengths when using the SN65LBC184 driver must be not greater than 5.85 meters (19 feet) for a signal velocity of 78% and minimum driver output rise or fall time of 250ns.