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Input and output capacitance are 1.7pf and 1.2pf respectively. However, these are typical values so please add 25/30% to accommodate part to part variation.
1. The capacitance values given are for the input and output capacitances of the device itself. Does this mean that the DS25BR440 or DS10BR254 devices are characterized with no loading on the outputs? If that is the case, how does output loading affect the datasheet parameters? 2. The datasheets indicate that the devices are designed to drive balanced copper cabling. How do I determine the maximum length of cable that can be driven? 3. Do either of the devices have a minimum operating frequency? My input signal will be around 40MHz.
1). In production, devices are tested using DC and AC test circuit as shown in the data sheet.
2). These are LVDS buffers. IBIS file along with s-parameter of your cable or media can be used to some level of signal integrity. Alternatively you can build a test board using this part with your media or cable and allow some margin.
