ZHCSPC1P February 2002 – February 2022 SN65HVD10 , SN65HVD11 , SN65HVD12 , SN75HVD10 , SN75HVD11 , SN75HVD12
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, therefore giving a maximum physical stub length as shown in Equation 1.
where
Per Equation 1, Table 10-1 lists the maximum cable-stub lengths for the minimum-driver output rise-times of the SN65HVD1x full-duplex family of transceivers for a signal velocity of 78%.
| DEVICE | MINIMUM DRIVER OUTPUT RISE TIME (ns) | MAXIMUM STUB LENGTH | |
|---|---|---|---|
| (m) | (ft) | ||
| SN65HVD10 | 3 | 0.07 | 0.23 |
| SN65HVD11 | 10 | 0.23 | 0.75 |
| SN65HVD12 | 100 | 2.34 | 7.67 |