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UC5170CQ датащи(PDF) 3 Page - Texas Instruments |
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UC5170CQ датащи(HTML) 3 Page - Texas Instruments |
3 / 9 page UC5170C APPLICATION INFORMATION Slew Rate Programming Slew rate for the UC5170C is set up by a single external resistor connected between the SRA pin and ground. Slew rate adjustments can be approximated by using the following formula: V ⁄ µs = 20 RSRA (RSRA in k Ω) The slew rate resistor can vary between 2k and 10k 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 recommended output characteristics for cable length and data rates can be found in EIA standard EIA423A +V.10. Approximations of these standards are given by the following equations: 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 output swing in microseconds. For data rates below 1k bit/s t may be up to 300 microseconds. Output Voltage Programming The UC5170C has two programmable output modes, either a low voltage mode which meets EIA423A, EIA232E/V.28/V.10 specifications, or the high output mode which meets the EIA232E, V.28 specifications. The high output mode provides greater output swings, minimum of 3V below and supply rails for driving higher, attenuated lines. This mode is selected by connecting the mode select pins to their respected supplies, MS+ to V+ and MS- to V-. The low output mode provides a controlled output swing and is accomplished by connecting both mode select pins to ground. AC PARAMETER TEST CIRCUIT AND WAVEFORMS AC CHARACTERISTICS Driver Slew Rate Low Output Driver tR & tF (10-90%) EIA232E + EIA423A Mode 3 |
Аналогичный номер детали - UC5170CQ |
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Аналогичное описание - UC5170CQ |
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