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UC5172QTR Datasheet(PDF) 3 Page - Texas Instruments |
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UC5172QTR Datasheet(HTML) 3 Page - Texas Instruments |
3 / 6 page AC PARAMETER TEST CIRCUIT AND WAVEFORMS UC5172 APPLICATIONS Slew Rate Programming Slew rate for the UC5172 is set up by a single external re- sistor connected between the SRA pin and ground. Slew rate adjustments can be approximated by using the fol- lowing formula: V/ µs = 20 RSRA (RSRA in k Ω) The slew rate resistor can vary between 2k and 10k Ω which allows slew rates between 10 to 2.2V/ µs, respec- tively. The relationship between slew rate and RSRA is shown in the typical characteristics. Waveshaping of the output lets the user control the level of interference (near-end crosstalk) that may be coupled to adjacent circuits in an interconnection. The recom- mended output characteristics for cable length and data rates can be found in EIA standard EIA-423A. Approxima- tions of these standards are given by the following equa- tions: Max. Data Rate = 300/t (For data rates 1k to 100k bit/s) Max. Cable Length (feet) = 100 x t (Max. length 4000 feet) where t is the transition time from 10% to 90% of the out- put swing in microseconds. For data rates below 1k bit/s, t may be up to 300 microseconds. The UC5172 has been used in applications up to 460KBPS. AC CHARACTERISTICS Driver Slew Rate Driver tR & tF (10-90%) EIA-423A Mode 3 |
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