TLC7524 basic question

Takumi Suzuki1 said:

Q1) propagation delay timing

       I do not understand well about the start timing of the delay. There describes the start timing is "digital input" on the datasheet.

       Does "digital input" mean the input of "DB0-DB7" data, right? (Please see below signal chart.)

This timing describes the time between when a latch is triggered by the digital interface to when the analog output has risen to 90% of the final value. For the mode of operation you have proposed in this post, digital input means the input of DB0-DB7 - so you are correct.

Takumi Suzuki1 said:

Q2) In case of "CS=L and WR=L fixed using"

       In case of both CS and WR = L(fixed),  the output analog signal will be changed after 80ns(max, =propagation delay) when DB0-DB7 is cahnged. Is my understanding correct?

Correct.

Takumi Suzuki1 said:

Q3) CS=L, WR=L, Data changing cycle is 100nSec

       Does the device work correctly with above condition?

I believe this is correct. This is an old part, though, and I do not have a test set up to confirm with bench results at this time, though.