level and edge triggered 74HC 573 / 574

[atferrari]

The 74HC573 is an octal D-type transparent latch where latch is activated when the LE output is high.

The 74HC574 is an octal D-type flip flop with latched output activated by the positive edge of its LE output.

My questions:

What is the specific use of each type, thinking of the way their output is latched?

Is it ANY particular case where ANY of them could be used with no sensible difference?

First time I find myself looking for differences between them.

 

[dr pepper]

You could say the '574 is a '573 with a cap in series with the le pin.
Slew rates and timings of clock signals affect which one is right for the job.

 

[dougy83]

The transparent latch reduces the effective delay of the signals w.r.t. the latching edge (the output will already have the correct value when the latch is applied {falling edge in this case}) cf. the D FF, where the output will only update some time after the clock edge (rising in the case of positive-edge-triggered FF).