SN74LVC1G74: Timing issues

Hi Yoav,

Yoav Benita said:

1. When I turn on the device, with the next inputs:
PRE_N = 'H'
CLR_N = 'H'
D = 'H'
CLK = 'L'

The output is 'H' (Q = 'H'), is that according to the spec ?

if D = 'L'/'X', the output is 'L' (Q = 'L')

Yes that is correct 

.

Yoav Benita said:

2. CLR_N and PRE_N, working on rising (0->1) or falling (1->0) edge ?

My test (on CLR_N) shows that its working on falling edge, is that right ?

Pre and Clear are not edge triggered these are level triggered inputs.

Yoav Benita said:

3. what is the meaning of Positive-Edge-Triggered ? rising (0->1) or falling (1->0) edge ?

This will mean going low -> high or 

Yoav Benita said:

rising (0->1)

Regards,

Owen