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MAX3077E Datasheet(PDF) 25 Page - Texas Instruments |
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MAX3077E Datasheet(HTML) 25 Page - Texas Instruments |
25 / 37 page SN65HVD30-EP, SN65HVD31-EP, SN65HVD32-EP SN65HVD33-EP, SN65HVD34-EP, SN65HVD35-EP www.ti.com SGLS367E – SEPTEMBER 2006 – REVISED SEPTEMBER 2015 Typical Application (continued) 10.2.1.2 Stub Length When connecting a node to the bus, the distance between the transceiver inputs and the cable trunk, known as the stub, must be as short as possible. Stubs present a nonterminated piece of bus line that can introduce reflections as the length of the stub increases. As a general guideline, the electrical length, or round-trip delay, of a stub must be less than one-tenth of the rise time of the driver; thus giving a maximum physical stub length as shown in Equation 1. Lstub ≤ 0.1 × tr × v × c where: • tr is the 10/90 rise time of the driver • c is the speed of light (3 × 10 8 m/s) • v is the signal velocity of the cable or trace as a factor of c (1) Per Equation 1, Table 8 shows the maximum cable-stub lengths for the minimum driver output rise times of the SN65HVD3x-EP full-duplex family of transceivers for a signal velocity of 78%. Table 8. Maximum Stub Length MAXIMUM STUB LENGTH MINIMUM DRIVER OUTPUT RISE TIME DEVICE (ns) (m) (ft) SN65HVD30 4 0.1 0.3 SN65HVD31 25 0.6 1.9 SN65HVD32 120 2.8 9.2 SN65HVD33 4 0.1 0.3 SN65HVD34 25 0.6 1.9 SN65HVD35 120 2.8 9.2 10.2.1.3 Bus Loading The RS-485 standard specifies that a compliant driver must be able to driver 32 unit loads (UL), where 1 unit load represents a load impedance of approximately 12 k Ω. Because the SN65HVD30 and SN65HVD33 devices are 1/2 UL transceivers, it is possible to connect up to 64 receivers to the bus. Likewise, the SN65HVD31, SN65HVD32, SN65HVD34, and SN65HVD35 devices are 1/8 UL transceivers that can support up to 256 receivers. Copyright © 2006–2015, Texas Instruments Incorporated Submit Documentation Feedback 25 Product Folder Links: SN65HVD30-EP SN65HVD31-EP SN65HVD32-EP SN65HVD33-EP SN65HVD34-EP SN65HVD35-EP |
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