Hi,
I have a question.
Let's say I have 1 buffer connected to a clock, T(High)=10ns, T(Low)= 5ns .
Suppose I can control Tpd. What will happen if I set a long Tpd lets say 40ns?
Will the buffer ignore the clock and get stuck on initial value?

thank you!

 

Hi,
I have a question.
Let's say I have 1 buffer connected to a clock, T(High)=10ns, T(Low)= 5ns .
Suppose I can control Tpd. What will happen if I set a long Tpd lets say 40ns?
Will the buffer ignore the clock and get stuck on initial value?

thank you!

Not necessarily. It is likely that the waveform will go through the buffer with the 40 ns of delay, and will be faithfully reproduced at the output with that delay. A typical opto-isolator has a relatively high maximum frequency, but a somewhat longer propagation delay than you would expect.

http://pdf.datasheetcatalog.com/datasheet/fairchild/6N136.pdf

Notice the claim that it can pass signals at 1 MHz., but the prop delay can be up to 2μsec maximum. finding an opto with a low propagation delay on the order of 40 nsec. is actually quite a challenge.