ikalogic
Member
Hello Electro-tech,
I am trying to correctly understand and interpret a (critical, for my application) part this datasheet: https://www.farnell.com/datasheets/9143.pdf
Okay, some background: I have a 80MHz CMOS clock input, and i need to generate a 40 MHz CMOS clock output (maybe with some delay, but that's not the point for now). The main objective is to have very low jitter (way below 50 ps).
Datasheet says jitter for CMOS output is below 0.35 ps, so far so good!
Now, on page 4 of the datasheet, we can see the typical, maximum and minimum values for specks like output rise and fall times. If we take for example the cmos output rise and fall times, we find huge differences between typical and maximum times (more than 300 ps).
For me, there are two ways of understanding this:
I know this may seem obvious, but i am in doubt!
Thanks a lot in advance for your help.
I am trying to correctly understand and interpret a (critical, for my application) part this datasheet: https://www.farnell.com/datasheets/9143.pdf
Okay, some background: I have a 80MHz CMOS clock input, and i need to generate a 40 MHz CMOS clock output (maybe with some delay, but that's not the point for now). The main objective is to have very low jitter (way below 50 ps).
Datasheet says jitter for CMOS output is below 0.35 ps, so far so good!
Now, on page 4 of the datasheet, we can see the typical, maximum and minimum values for specks like output rise and fall times. If we take for example the cmos output rise and fall times, we find huge differences between typical and maximum times (more than 300 ps).
For me, there are two ways of understanding this:
- The typical, maximum and minimum values in the datasheet reflects the differences that can exist between two different chips. It does not mean that the same chip will observe a variation of 300 ps in it's rise/fall times, specially if the operating conditions (temperature/VCC) do not change.
- The typical, maximum and minimum values apply to the same chip, and can be observed on the very same IC, with or without changing the operating conditions (like temperature and VCC).
I know this may seem obvious, but i am in doubt!
Thanks a lot in advance for your help.
