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 non-terminated 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:

• t_r is the 10/90 rise time of the driver
• c is the speed of light (3 × 10⁸ m/s)
• v is the signal velocity of the cable or trace as a factor of c

THVD1454 can be used in both slow speed and high speed networks with SLR pin configurability. Slew rate limiting makes the driver output rise or fall time slower so that stub lengths can be increased.