Hi,
There without any jitter limitation for MK70FN1M0VMJ12 system oscillator or RTC oscillator module.
The external input clock with below requirement:

If you consider to use RESET_b pin to reset the chip, there with the minimum pulse width that is guaranteed to be recognized as a pin interrupt request.
The Min. external reset pulse width is 100ns.
There with no rise time limitation for reset_b signal.
Wish it helps.
best regards
Ma Hui
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