This circuit is not switch de-bouncer. This is actually a pulse generator intended to generate a short pulse based on the IRQ_C_CH2's input low to high transition irrespective of how long that transition takes place. It's a type of one-shot circuit presumably to assert an interrupt one time otherwise the ISR keeps getting called while IRQ_C_CH2 is high indefinitely. R38, C35, and U6B set up an "inverting delay" into the AND gate.
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