propagation delay of sn74hc125

Status
Not open for further replies.
khaled ragab said:
hello i am confused about the propagation delay and the rise and fall time the datasheet here https://www.ram-e-shop.com/ds/74xx/74125.pdf express tpd=30ns for example, but the rise and fall time delay is 500ns how can i calculate the whole delay
Click to expand...

Hi;
The above 500 ns is the maximum allowed rise and fall time of the input waweform (input transition rise/fall time), NOT a delay !!!
The max. whole delay is (at 25 degr, 50 pF and 4.5 V) is appr 30 ns (Tplh or Tphl = Tpd, from/to the 50% of the input transition, see the figure)
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…