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DS1488 Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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DS1488 Datasheet(HTML) 3 Page - National Semiconductor (TI) |
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3 / 6 page  Applications By connecting a capacitor to each driver output the slew rate can be controlled utilizing the output current limiting characteristics of the DS1488. For a set slew rate the ap- propriate capacitor value may be calculated using the fol- lowing relationship C = I SC (∆T/∆V) where C is the required capacitor, I SC is the short circuit current value, and ∆V/∆T is the slew rate. RS-232C specifies that the output slew rate must not ex- ceed 30V per microsecond. Using the worst case output short circuit current of 12 mA in the above equation, calcu- lations result in a required capacitor of 400 pF connected to each output. See Typical Performance Characteristics. Typical Applications RS-232C Data Transmission DS005776-3 Note 5: Optional for noise filtering DTL/TTL-to-MOS Translator DS005776-4 DTL/TTL-to-HTL Translator DS005776-5 DTL/TTL-to-RTL Translator DS005776-6 www.national.com 3 |
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