What is "recovery time" on CY74FCT191T datasheet
What does recovery time mean in ICs datasheet?


In this case we are talking about data latches that latch data on the rise or falling edge of the CLK for that section. They indicate that /PL will only function if those time boundaries are met. /PL stands for Parallel Load, which is asynchronous to the clock 'CP'.They indicate  the time for rising /PL recovers to allow a new CP, or clock pulse. That is /PL must be high for Trec time before a new clock pulse, or data output is unknown.

Also a data change when clock is changing could result in ambiguous data, a 'metastable state', so they are giving you the 'window' width in nS in which /PL will not work correctly. They are actually telling you not to do a parallel load during this window when the CP clk might also be changing the count value.

It is in effect a 'keep-out' window. Do not use CP inside this window of 'n' ns when /PL is low.

HINT: This IC counts on the rising edge of the clock 'CP', so you can use the falling edge to enable the /PL signal. This way they will not collide at the same time. A simple OR gate would work. By the way, the /PL signal overrides the CP clk, so it is up to you to decide which function is most important while the clock is running.