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As FvM said, for the internal oscillator for those parts the spec is min of 55MHz, max of 116MHz, typical value of 82MHz. You do not get to choose the frequency, all you know is it will be in that range. Your 74MHz part is perfectly normal. You may get one part that runs at 60MHz, another at 110MHz. All these are valid.
If you need a more accurate frequency reference, you must use an external clock source, like a CMOS crystal oscillator with an accuracy of 25ppm to 100ppm.
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Thank You for the response. I do have a 50 Mhz clock oscillator on the demo board and I am using it along with a PLL instance, to obtain the exact frequency I need. Did not realized though, that the internal oscillator has a range.
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