CY2305 Behavior on Removal of Input Reference | Cypress Semiconductor
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CY2305 Behavior on Removal of Input Reference
What is the effect on the CY2305 output when the input reference clock is removed?
The output usually holds the original frequency for only a few cycles. Generally you cannot expect more than 2 or 3 cycles at the normal frequency. It then drops toward to a lower frequency.
100 MHz drops towards 80 MHz, stops after ~120 cycles
80 MHz drops towards 70 MHz, stops after ~120 cycles
60 MHz drops towards 50 MHz, stops after ~90 cycles
40 MHz drops towards 30 MHz, stops after ~50 cycles
20 MHz drops towards 14 MHz, stops after ~25 cycles
10 MHz goes very quickly towards 5 MHz, stops after ~10 cycles
In all cases for the frequencies above, the output clock stops about 1.5 to 2 microseconds.